The phrases "If I were" and "If I was" are both used in conditional sentences to express hypothetical or unreal situations. 
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"If I were" - Hypothetical situations(something that is not true)
If I were a bird, I would fly across the world.
If I were you, I would take that job offer.
If I were rich, I would travel the world.
If I were a superhero, I would save the world from evil.
If I were the president, I would prioritize education and healthcare.
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"If I was" - past tense of the verb "to be" and is used to describe past events or situations.
If I was late yesterday, I apologize.
If I was the one who broke the vase, I will replace it.
If I was at the party last night, I must have missed you.
If I was wrong, I apologize for any confusion caused.
If I was in your shoes, I would have made the same decision.

Note:  1. If the sentence starts with either of the phrases then there will be a comma after the first clause. See the above examples. 
2. If the sentence neither starts with "If I were" nor "If I was" phrases then there will be no comma after the first clause.
I will replace it If I was the one who broke the vase.
I would travel the world If I were rich.

Everyone: It is a pronoun that refers to all the people in a group

Everyone is invited to the party.
Everyone needs to submit their forms by tomorrow.
Everyone enjoyed the concert.
The new protocols will affect everyone positively.
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Every one: This phrase is used to refer to each individual item or person in a group.

Every one of the books on the shelf is worth reading.
Please take your time and consider every one of the options carefully.
My mother would like to thank every one of you who offered assistance during her illness.
I asked them to introduce themselves, and every one of them did so enthusiastically.

"I would like" is a phrase used to express a desire or preference for something. 

"I would like a glass of water, please." (Requesting a specific item)
"I would like to go to the movies tonight." (Expressing a preference or desire)
"I would like to know more about quantum physics." (Seeking information or knowledge)

Ordering at a restaurant:

"I would like the spaghetti carbonara, please."
"I would like a medium rare steak with a side of mashed potatoes."
Making a request:

"I would like to schedule a meeting for tomorrow."
"I would like your assistance with this project."
Expressing preferences:

"I would like to visit Italy for my next vacation."
"I would like a blue shirt instead of a red one."
Seeking information:

"I would like to know more about the history of ancient civilizations."
"I would like to understand how this software program works."
Making a purchase:

"I would like to buy a new smartphone."
"I would like to purchase two movie tickets for tonight's show."
Requesting a service:

"I would like to book a hotel room for two nights."
"I would like to schedule a haircut for next week."

Might have(less probable)
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- Might express an opinion: an uncertain guess, a speculation, based on very little information. 
- Might have expressed an opinion about an earlier (past) situation.

"She might have forgotten her keys at home." (There is a possibility that she forgot her keys.)
The car driver might have tried to pass between two buses.
One of the bus drivers might have changed lanes without looking first.
The bus drivers might not have been able to see the smaller, lower car.
The road might have narrowed and so they all tried to move into the same lane
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May have(probability)
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used to express a possibility or likelihood about a past event that is more neutral or balanced in terms of probability.

 "They may have left the party before we arrived." (There is a possibility that they left the party before we arrived.)
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Must have
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Must express an opinion: an inference, a conclusion, based on known details. Must have expressed an opinion about an earlier (past) situation.

"He must have arrived early because his car is already parked." (Based on the evidence of the parked car, it is inferred that he arrived early.)
The car driver must have panicked when he saw the buses moving in on both sides.
The bus passengers must have heard a crunch. (sound)
The car passengers must have escaped out the back.  (No other exits were available.)
The insurance company must have declared this car "totaled".

Should be": When we say something "should be" a certain way, it means we expect or recommend it to be like that. 
Examples:
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You should be polite to your elders.
The report should be submitted by the end of the day.
He should be more focused during class.
The customer service representative should be able to assist you with your issue.
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"Could be": When we say something "could be" a certain way, it means there's a possibility or chance for it to be like that.
Examples:
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The movie could be really entertaining.
We could be late if we don't leave soon.
The answer to the question could be found in the textbook.
The meeting could be rescheduled due to unforeseen circumstances.

Like: "Like" is a preposition or conjunction that is used to compare two things or draw similarities between them.

Examples
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She sings like an angel.
He looks like his father.
It tastes like chocolate.
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As: "As" can be used as a conjunction, preposition, or adverb. It is used to establish a relationship or similarity between two things or actions. It can also be used to introduce a clause that provides an explanation or reason. 

Examples:
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She runs as fast as a cheetah.
I work as a teacher.
As it was raining, we decided to stay indoors.

So am I and "So do I are phrases used to express agreement or similarity with a positive statement made by someone else. 

So am I
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"So am I" is used to agree with a positive statement about a specific characteristic or quality. It is used when the speaker wants to indicate that they have the same characteristic or qualities as the person they are responding to. 

Examples
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Person A: "I am really excited about the concert."
Person B: "So am I."
Person A: "I'm happy with the result."
Person B: "So am I."
Person A: "I'm feeling quite nervous."
Person B: "So am I."
Person A: "I'm glad we made it on time."
Person B: "So am I."
Person A: "I'm really tired."
Person B: "So am I."
Person A: "I'm a huge fan of basketball."
Person B: "So am I."
Person A: "I'm studying for my exams."
Person B: "So am I."
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So do I
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"So do I" is used to agree with a positive statement about an action or activity. It is used when the speaker wants to indicate that they perform the same action or engage in the same activity as the person they are responding to.

Examples:
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Person A: "I love to travel."
Person B: "So do I."
Person A: "I play the guitar."
Person B: "So do I."
Person A: "I enjoy cooking."
Person B: "So do I."
Person A: "I speak Spanish fluently."
Person B: "So do I."
Person A: "I enjoy reading books."
Person B: "So do I."
Person A: "I like to go hiking on weekends."
Person B: "So do I."
Person A: "I love eating ice cream."
Person B: "So do I."

"Else" is an adverb that is used to indicate alternatives or additional options in relation to something previously mentioned or understood. 

Someone/something else:

Is there someone else who can help me?
I want something else to eat.
I don't want to go anywhere else.
Or else:

Hurry up, or else we'll be late.
Do your homework, or else you won't be allowed to play.
You need to follow the instructions, or else it won't work.
Anything/anyone else:

Is there anything else you need?
Anyone else coming to the party?
I don't want to discuss anything else right now.
Nothing else:

I have nothing else to say.
There's nothing else in the fridge.
We need to consider nothing else but the facts.
Somewhere else:

Let's go somewhere else for a change.
I'd rather be somewhere else right now.
I left my keys somewhere else.

Also
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"Also" is used to add information or to indicate that something is in addition to what has been mentioned.
Examples
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She speaks French fluently. Also, she is learning Spanish.
I enjoy swimming. Also, I like playing basketball.
The book was interesting, and it also had beautiful illustrations.
I need to finish my work, and I also have to run some errands.
The movie not only had a great plot but also had stunning cinematography.

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Too:
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"Too" is also used to add information or indicate that something is in addition to what has been mentioned. It shows that the speaker shares the same characteristic, experiences, or actions as someone else.
Examples
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She speaks French fluently, and I do too.
I enjoy swimming, and I like basketball too.
She not only sings well but also dances well too.
They not only won the championship but also set a new record too.
She not only sings well but also dances well too.
They not only won the championship but also set a new record too.
He not only studies hard but also participates in extracurricular activities too.
He not only studies hard but also participates in extracurricular activities too.

Conjunctions are words or phrases that are used to connect words, phrases, or clauses within a sentence. They help to establish relationships between different parts of a sentence and contribute to the overall coherence and flow of the writing.

Coordinating Conjunctions:
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I like both coffee and tea.
He ran fast, but he couldn't catch the bus.
She is talented yet humble.

Coordinating conjunctions such as "and," "but," and "yet" are used to connect words, phrases, or independent clauses of equal importance.
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2. Subordinating Conjunctions:
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She went to the store after finishing her work.
I will study hard unless I pass the exam.
He left because he was feeling tired.

Subordinating conjunctions such as "after," "unless," and "because" introduce subordinate clauses, which are dependent on the main clause and provide additional information or indicate the relationship between the clauses.
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3. Correlative Conjunctions:
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Either you come with me, or I'll go alone.
Not only did she sing, but she also danced.
Whether it rains or shines, the event will go on.
Correlative conjunctions, such as "either...or," "not only...but also," and "whether...or," work in pairs to connect words, phrases, or clauses in parallel structures.

Articles are used to indicate whether a noun is referring to a specific or non-specific item or concept.

Think of the sky at night. In the sky, we see MILLIONS of stars and ONE moon. So normally we would say:

I saw a star last night.
I saw the moon last night.
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1. Definite Article (the):
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The cat is sitting on the wall.
I saw the movie last night.
She plays the piano very well.
The capital of France is Paris.
I have found the book that I lost.
Have you cleaned the car?
There are six eggs in the fridge.
Please switch off the TV when you finish
Please pass me the book on the shelf.
The sun is shining brightly today.
Have you seen the movie we were talking about?

The definite article "the" is used when referring to a specific noun that is known to both the speaker and the listener. It is used to indicate that there is a particular item or concept being referred to.
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2. Indefinite Articles (a, an):
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I bought a new car.
She wants to be an actress.
He ate an apple for breakfast.
I was born in a town.
John had an omelet for lunch.
James Bond ordered a drink.
We want to buy an umbrella.
Have you got a pen?
She bought a new dress for the party.
I saw an interesting bird in the park.
He wants to be an engineer when he grows up.
I need an umbrella because it's raining outside.
Can you pass me a pen, please?
She adopted a puppy from the animal shelter.


The indefinite articles "a" and "an" are used when referring to a non-specific noun or when introducing something for the first time. "A" is used before words that start with a consonant sound, while "an" is used before words that start with a vowel sound.
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"On" is often used to indicate participation in an activity or event. 
For example:
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"I went on a date."
"They went on a trip."
"She went on a shopping spree."
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"To" is commonly used to indicate movement towards a specific destination or purpose. 

For example:
-----------------------------------
"I went to the store."
"They went to the park."
"She went to the doctor."

1. "Talk" is generally used to refer to informal or casual conversations between two or more people. It can also imply a back-and-forth exchange of ideas or information. For example:
    - Let's sit down and talk about our plans for the weekend.
    - I talked to my friend on the phone for hours.
    - The students were talking and laughing in the cafeteria.
2. "Speak" is typically used in more formal or professional settings. It often suggests a one-way communication or a formal presentation. It can also refer to someone's ability or proficiency in a particular language. 
    
    "Speak" is frequently used when discussing specific languages or language skills: "She speaks Mandarin.”
    

For example:

- The professor spoke about the importance of research in his field.
- I need to speak with the manager about a complaint.
- She speaks French fluently.

"on one's own," generally implies that you are engaging in an activity or accomplishing a task without any external help or companionship.

on my own/on your own/on her own/on their own
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"I decided to go hiking on my own to enjoy the solitude and challenge myself."
"I prefer to study for exams on my own, as it allows me to focus without any distractions."
"I often travel on my own because it gives me the opportunity to explore new places at my own pace and meet new people along the way."
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"by myself" means that you are doing something alone, without the company.

by + reflexive pronouns(myself, herself, himself)
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"I enjoy going to the movies by myself. It gives me the freedom to choose the films I want to watch and relax without having to coordinate with others."
"I like to cook by myself. It gives me a chance to experiment with different flavors and techniques without any interruptions."

"I would want" is a phrase that expresses a strong desire or preference for something.

"I would want to live in a peaceful world." (Expressing a strong desire or preference)
"I would want to be promoted to a managerial position." (Expressing a career aspiration)
"I would want a brand-new car as my next purchase." (Expressing a strong preference for a specific item)

Expressing personal desires:

"I would want to travel the world and experience different cultures."
"I would want to spend more time with my family."
Stating career aspirations:

"I would want to become a successful entrepreneur."
"I would want to pursue a career in medicine."
Expressing personal preferences:

"I would want a beachfront property for my dream home."
"I would want a chocolate cake for my birthday."
Stating personal goals:

"I would want to run a marathon by the end of the year."
"I would want to learn a new language fluently."
Expressing relationship desires:

"I would want to find a life partner who shares my interests and values."
"I would want to build strong friendships that last a lifetime."
Stating academic ambitions:

"I would want to earn a Ph.D. in psychology."
"I would want to excel in my studies and graduate with honor

I'm in the office 
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usually refers to being physically inside the workspace, and it can also imply that the person is currently working.

Eg: I'm in the office right now, but I'll be leaving soon.
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 I'm at the office

usually refers to a more general location, and it can imply that the person is going to or has plans to go to the office, but may not be physically present there at the moment.
Eg: I'll be at the office tomorrow for a meeting.

Until/till: "Until" is a preposition or conjunction that indicates the time up to which an action or event continues or the point in time at which something changes. It is often used to express a limit or a specific duration. 

Examples:
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She worked until midnight.
Please wait here until I come back.
They will stay in the hotel until Sunday.
He waited till the last minute to submit the assignment.
The store is open till 9 p.m.
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Still: "Still" is an adverb that indicates a continuous or ongoing situation or condition. 
Examples
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She is still waiting for her friend.
The baby is still sleeping.
He still loves to play the piano.

Me neither" is a phrase used to express agreement or similarity with a negative statement made by someone else.

Examples
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Person A: "I don't like spicy food."
Person B: "Me neither."

Person A: "I haven't seen that movie."
Person B: "Me neither."

Person A: "I don't enjoy shopping for clothes."
Person B: "Me neither."

Person A: "I haven't been to Paris."
Person B: "Me neither."

Person A: "I don't like coffee."
Person B: "Me neither."

Person A: "I'm not a fan of horror movies."
Person B: "Me neither."

Person A: "I haven't tried sushi before."
Person B: "Me neither."

Person A: "I can't swim."
Person B: "Me neither."

Person A: "I don't enjoy public speaking."
Person B: "Me neither."

The past perfect tense is a verb tense used to describe an action or event that occurred before another action or event in the past. It emphasizes the sequence of events and establishes a clear timeline of past actions.

Subject + auxiliary verb 1 (had) + auxiliary verb 2  + past participle verb

Examples:
+	I	had been	working.	 
+	You	had been	playing	tennis.
-	It	had	not	been	working	well.
-	We	had	not	been	expecting	her.
?	Had	you been	drinking?	 
?	Had	they been	waiting	long?

She had already finished her work before the meeting started.
They had gone to the store before it closed.
He had studied French for three years before he traveled to Paris.
By the time I arrived, they had already left.

It is important to note that the past perfect tense is typically used in contexts where there is a need to establish a clear time relationship between two past actions or events.

Sarah had already finished her homework when her friends came over.
The train had left by the time we reached the station.
They had already eaten dinner when we arrived at the restaurant.
By the time I woke up, my family had gone on a trip without me.
The movie had already started when we got to the theater.
He had studied for the exam, so he felt confident when it began.
The storm had passed by the time we ventured outside.
She had read the book before watching the movie adaptation.
By the time they arrived, the party had already ended.
The company had already made the decision before I joined the meeting.

In each of these sentences, the past perfect tense is used to describe an action or event that occurred before another action or event in the past. It establishes the sequence of events and emphasizes that the action in the past perfect had taken place prior to the other action in the simple past or past tense.

It refers to the rule that the subject of a sentence must agree in number (singular or plural) with the verb. 

1. If the subject is singular, the verb should be singular, and 
2. If the subject is plural, the verb should be plural.

For example:
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Singular subject: "She runs every morning."
Plural subject: "They run every morning."

1. Singular subject and singular verb:

The dog barks at the mailman.
He plays the piano beautifully.
She runs five miles every day.

2. Plural subject and plural verb:

The dogs bark at the mailman.
They play soccer in the park.
We eat lunch together every day.

3. Singular subject and singular verb with third-person singular pronouns:

My sister likes to read books.
The cat jumps onto the table.
John works as a software engineer.

4. Subject and verb agreement with compound subjects:

Mary and John are going to the party.
Apples and oranges are fruits.
Swimming and running are his favorite activities.

5. Subject and verb agreement with indefinite pronouns:

Everyone is invited to the meeting.
Somebody left their umbrella behind.
Nothing was done to solve the problem.