We use may:
Jack may be coming to see us tomorrow.
(= Perhaps Jack will come to see us tomorrow.)
Oh dear! It's half past ten. We may be late for the meeting.
(= Perhaps we will be late for the meeting.)
She's had no sleep. She may be tired.
(= Perhaps she is tired.)
- to ask for permission in a formal way:
May I borrow the car tomorrow?
May we come a bit later?
- to give permission in a formal way:
You may go now.
You may come at eleven if you wish.
- to say that someone has permission in a formal way:
Students may travel for free.
We can use may not to refuse permission or to say that someone does not have permission, but it is formal and emphatic:
You may not borrow the car until you can be more careful with it!
Students may not wear jeans.
We use might when we are not sure about something in the present or future:
I might see you tomorrow.
It looks nice, but it might be very expensive.
It's quite bright. It might not rain today.
We use may have and might have to make guesses about the past:
I haven't received your letter. It may have got lost in the post.
It's ten o'clock. They might have arrived by now.
We also use might:
- as the past tense of requests with may:
He asked if he might borrow the car.
They wanted to know if they might come later.
- as a very polite way of asking for permission:
Might we ask you a question?
Might I just interrupt for a moment?
Questions and negatives
We make questions by putting the subject after may/might:
May I …? Might I …?
The negative forms are may not and might not.
- may and might 1
- may and might 2
Hello sir ,
Is infinitive verb always after modal verb ?
I’ve seen many example but in this sentence it’s quiet different (My camera may be broken ) you can find it in first example in first exercise .correct me if i’m wrong please .
Yes, that's right. Actually, this example is the same: may (modal verb) and be broken (infinitive verb 'be' + adjective 'broken').
The LearnEnglish Team
"Do you think John may have completed the report by now ?"
If we leave out "may" here ,is the meaning still the same?
No, I'm afraid not. In fact, 'Do you think John have completed the report by now?' is not grammatically correct; 'have' should be 'has'.
'Do you think John has completed the report by now?' is a general question that, by itself, doesn't really suggest anything about the speaker's assessment of the situation. The question with 'may have completed' suggests that the speaker has an opinion about the matter, though what exactly it is isn't clear.
Hope this helps.
All the best,
The LearnEnglish Team