It may (might) not be true.
He may (might) be busy.
They may (might) know.
He may (might) still be abroad.
She may be late.
He may pass the exam.
We may go to the Volga.
She may come tomorrow.
I may buy this book in Moscow.
She may send us an e-mail.
They may forget to bring the newspaper.
He may have already done his homework.
My sister may have already spoken to them.
They may have gone abroad.
My brother may have forgotten to ring you up.
She may have bought the tickets.
Grandmother may be sleeping.
The children may be playing at the river.
They may be discussing the question at the moment.
They may be having dinner at the moment.
He may be lying on the grass and looking at the clouds now.
She may have changed her plans.