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We use the present simple for things that we do regularly and for facts, habits, truths and permanent situations. We often use simple present Tense to express a future event that is part of a fixed timetable or programme.
For example

1. The sun rises in the east.(fact)

2. I get up every day at five am.(habitual action)

3. He works in a bank.(a permanent situation)

4. The examination  begins at 8 a.m. tomorrow.( a fixed timetable)

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We use the present continuous for things that are happening at the time we are speaking and for activities that are in progress.
For example

1. Just a minute. I’m checking my email. (now)

2. I’m studying Economics (activity in progress)

We can also use the present continuous for future arrangements, usually with a time expression.

·         I'm seeing the doctor on Monday morning.

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Present Continuous Tense - Learn Basic English Grammar | Kids Educational Video

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To indicate completed activities in the immediate past. (With  just, already, yet ) and to denote an action beginning at some time in the past and continuing up to the present moment. Often with since/for.
For example

1.I have just completed my work.

2.We have lived here for ten years.

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Present perfect with 'ever' and 'never' - 6 Minute Grammar

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An  action that started in the past and still continuing.
For example

o    I have been writing articles on different topics since morning.

o    He has been reading the book for two hours.

o    They have been playing football for an hour.

o    She has been searching the dress since morning.

o    He has been studying in the library for three hours.

o    We have been shopping at this fair for two hours.

Notes: Use since to tell about the point of time and use for to tell about duration of time

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Present perfect continuous in English | Learn English with Cambridge

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I, we, you they and plural subject + V1
He ,She ,it and singular subject + V1(s/es/ies)
Negative Sentence
I, we, you they and plural subject + do not+V1
He , She ,It and singular subject + does not+ V1.
Question
Do +I, we, you they and plural subject + V1?
Does+ He , She ,It and singular subject + V1 ?

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I, we, you they and plural subject + am/are+V.ing
He ,She ,It and singular subject +is+ V..ing |
Negative Sentence
I, we, you they and plural subject + am/are not+V...ing
He ,She ,It and singular subject +is not+ V..ing |
Question .
Am/Are +I, we, you they and plural subject + V..ing?
Is + He ,She ,It and singular subject + V...ing ?

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Note: There are some verbs that we don’t usually use in the continuous form. They are often verbs of thinking and feeling, for example: hear, see, smell, hate, know, understand, believe, want, need.

WRONG: Could you explain that again? I’m not understanding.
CORRECT: Could you explain that again? I don’t understand.

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I, we, you they and plural subject + have+V3
He ,She ,It and singular subject +has+ V3 |
Negative Sentence
I, we, you they and plural subject + have not+V3
He ,She ,it and singular subject +has not+ V3
Question
Have +I, we, you they and plural subject + V3?
Has + He ,She ,It and singular subject + V3?

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Structure of Present Perfect Continuous Tense

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Structure of Present Perfect Continuous Tense

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I, we, you they and plural subject + have been+V..ing + since/for
He ,She ,It and singular subject +has been + v..ing +since/for Negative Sentence
I, we, you they and plural subject + have not been+V...ing+ since/for He ,She ,it and singular subject +has not been + V..ing+ since/for | Question
Have +I, we, you they and plural subject + been+ V..ing +since/for? Has + He ,She ,It and singular subject + been V...ing+ since/for ?

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It is used to indicate an action completed in the past.
For example

I received his letter yesterday.

He left school last year.

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The past simple tense - 6 Minute Grammar

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I, we, you they and plural subject + V2
He ,She , It and singular subject + V2
Negative Sentence
I, we, you they and plural subject + did not+V1
He , She ,It and singular subject + did not+ V1
Question
Did +I, we, you they and plural subject + V1?
Did+ He , She ,It and singular subject + V1 ?

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It indicates an action going on at some time in the past.The time of the action may or may not indicate.
For example
We were watching a movie yesterday.
It was raining heavily.

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Past simple and past continuous - 6 Minute Grammar

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I, we, you they and plural subject + was/were+V.ing
He ,She ,It and singular subject +was+ V..ing
Negative Sentence
I, we, you they and plural subject + was/were not+V...ing
He ,She ,It and singular subject +was not+ V..ing
Question
Was/Were+I, we, you they and plural subject + V..ing?
Was + He ,She ,It and singular subject + V...ing ?

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The Past Perfect tense expresses action in the past before another action in the past. This is the past in the past.
For example

When we arrived, the train had left.

I had written the letter before he came.

You can sometimes think of the Past Perfect tense like the Present Perfect tense, but instead of the time being now the time is before.
"We were too late. The train had left.

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The past perfect tense: how we form it and why we use it - English In A Minute

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I, we, you they and plural subject + had+V3
He ,She ,It and singular subject + had + V3
Negative Sentence
I, we, you they and plural subject + had not+V3
He ,She ,It and singular subject +had not+ V3
Question
Had +I, we, you they and plural subject + V3?
Had+ He, She, It and singular subject + V3?

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This tense an action that began in the past  and continued up to some time.
For example

1.    At that time he had been writing a novel for two months.

2.    When Mrs. Mary came to school in 1995, Mr. Anand had already been teaching there for five years.

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 | Structure of Past Perfect Continuous Tense

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 | Structure of Past Perfect Continuous Tense

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I, we, you they and plural subject + had been+V..ing + since/for
He ,She ,It and singular subject +had been + v..ing +since/for | Negative
I, we, you they and plural subject + had not been+V...ing+ since/for
He , She ,It and singular subject +had not been + V..ing+ since/for | Question
Had +I, we, you they and plural subject + been+ V..ing +since/for? Had + He , She ,It and singular subject + been V...ing+ since/for ?

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It indicates an action which is certain to happen in future. It is also used to talk about what we think or believe will happen in the future.

For example
It will be Diwali in a week.(certain to happen)
I think India will win the match. (think)
Structure of Future present Tense I, we, you they and plural subject + will + V1
He ,She ,It and singular subject + will +V1
Negative Sentence
I, we, you they and plural subject + will not+V1
He , She ,It and singular subject + will not+ V1.
Question
Will +I, we, you they and plural subject + V1?
Will+ He , She ,It and singular subject + V1 ?

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We use Future Continuous Tense to talk about actions which will be in progress at a time in the future.

For example
This time I will be sitting on the beach in Singapore.
I will be staying here till Sunday.

Structure of Future Continuous  Tense
I, we, you they and plural subject + will be+V.ing
He ,She ,It and singular subject +will be+ V..ing
Negative Sentence
I, we, you they and plural subject + will  not be+V...ing
He ,She ,It and singular subject +will not be + V..ing
Question
Will +I, we, you, they and plural subject + be+V..ing?
Will + He ,She ,It and singular subject +be+ V...ing ?

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Future Perfect Tense is used for actions which will be in progress over a period of time that will end in the future.

For example
I shall have written my exercise by then.
He will have left before you go to see him.

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This tense is used for actions which will be in progress over a period of time that will end in the future.

For example
By next March we shall have been living here for four hours.

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The Future Continuous through a story - Educraft

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Learn how to form the future perfect tense in English