Ken is very good at physics.He/solve/all the problems on his own
He must have solved all the problems on his own
I can't find my mobile phone. you ---------(leave) it somewhere.
might have left
Vivien is a very honest person.She/tell/the truth to the headmaster.
She must have told the truth to the headmaster.
This is not Pam's handwriting. She / write / the letter
she couldn't have written the letter
Maybe Tracy felt very tired. She /need/a holiday
She might have needed a holiday
Perhaps they were ill. They /go/to the hospıtal.
They might have gone to the hospital
Mike wasn't at the factory at the time. He/cause/the fire.
He couldn't have caused the fire
I am not sure, but Zeynep --------(buy) this present for me.
might have bought
Rick went to London last saturday. You/see/him in the post office this morning.
You couldn't have seen him in the post office this morning.
I am not sure Nehir waited there till the end. She/leave/early
She might have left early.
I can smell my sister's perfume . she /be/in my room a few minutes ago
she must have been in my room a few minutes ago