English gramar

How to form the present simple tense in English.
Structure of present simple
positive negative question
I work in a bank.
You work in a bank.
We work in a bank.
They work in a bank. I don't (do not) work.
You don't (do not) work.
We don't (do not) work.
They don't (do not) work. Do I work in a bank?
Do you work in a bank?
Do we work in a bank?
Do they work in a bank?
He works in abank.
She works in a bank.
The bank opens at 9 o'clock. He doesn't (does not) work.
She doesn't (does not) work.
It doesn't (does not) open at 9 o'clock. Does he work?
Does she work?
Does it open at 9 o'clock?

Present simple - common mistakes
Common mistakes Correct version Why?
I working in London. I work in London. The gerund ing form is not used in the present simple.
He work inLondon. He works in London. The third person he, she, itadds the letter s.
He work in London? Does he work in London? Questions - third person:
does + subject + infinitive.
All other persons:
do + subject + infinitive.
Work he in London? Does he work in London?
He not work in London. He doesn't work in London. Negatives - third person:
subject + doesn't + infinitive.
All other persons:subject + don't + infinitive.

The present continuous tense is sometimes called the present progressive.
Here is how to form the present continuous tense in English.
Structure of present continuous
positive negative question
I'm (I am) reading a book.
You're (you are) reading.
We're (we are) reading.
They're (they are) reading. I'm (I am) not reading.
You're (you are) not reading.We're (we are) not reading.
They're (they are) not reading. Am I reading?
Are you reading?
Are we reading?
Are they reading?
He's (he is) reading a book.
She's (she is) reading a book.
It's (it is) raining. He's not / he isn't (he is not) reading.
She's not / she isn't (she is not) reading.
It's not / it isn't (it is not) raining. Is he reading?
Is she reading?
Is it raining?Present continuous - common mistakes
Common mistakes Correct version Why?
They still waiting for you. They are still waiting for you. to form a continuous tense we use be + -ing.
They are still waiting for you? Are they still waiting for you? In questions the subject (they) and the auxiliary verb (be) change places.
Do they still waiting for you? Are they still waiting for you?
Where they arewaiting for you? Where are they waiting for you?
She doesn't watching TV. She isn't watching TV. To form the negative we put notafter the verb be (am not, is not = isn't, are not = aren't).
I'm believing you. I believe you. Some verbs are not used in continuous tenses - these are called stative verbs (e.g.believe, come from, cost, depend, exist, feel, hate, like).
Structure of past simplepositive negative question
I arrived yesterday.
You arrived yesterday.
He/she/it arrived.
We arrived.
They arrived. I didn't (did not) arrive.
You didn't (did not) arrive.
He/she/it didn't arrive.
We didn't arrive.
They didn't arrive. Did I arrive yesterday?
Did you arrive?
Did he/she/it arrive?
Did we arrive?
Did they arrive?

Past simple - common mistakes
Common mistakes Correctversion Why?
I was work in London. I worked in London. In positive sentences, a helping verb such as 'was' or 'did' is not used.
He worked in London? Did he work in London? The helping verb 'did' is used in past simple questions.
Worked he in London? Did he work in London? The helping verb 'did' is used in past simple questions.
Did he wrote a letter? Did he write a letter? The main verb is used inthe infinitive form in questions and negatives.
He didn't wrote a letter. He didn't write a letter. The main verb is used in the infinitive form in questions and negatives.

The past continuous tense is also sometimes called the past progressive.
Here is how to form the past continuous in English.
Structure of past continuous
positive negative question
I was reading a book.
He/she was...