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Tenses >> Present simple
Structure of present simple
I work in a bank. I don't (do not) work in a bank. Do you work in a bank?
He works in a bank. He doesn't (does not) work in a bank. Does hework in a bank?
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, it adds 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.









Tenses >> Past simple
Structure of past simple
I saw him yesterday. I didn't (did not) see him yesterday. Did you see him?

Past simple - commonmistakes
Common mistakes Correct version 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 inLondon? 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 aletter? The main verb is used in the 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 andnegatives.




Tenses >> Present perfect tens
Structure of present perfect
I've (I have) seen him. I haven't (have not) seen him. Have you seen him?
He's (he has) gone. He hasn't (has not) gone.Has he gone?


Present perfect simple - common mistakes
Common mistakes Correct version Why?
Steven has wrote a new book. Steven has written a new book. The past participle of the verb must be...