Gap-filling
You look so tired. You ______ have gone to bed earlier last night.
should / ought to
Must và can't không được dùng để suy đoán về ........
A. Hiện tại B. tương lai
Tương lai
You should have went to the meeting — it was important.
went → gone
(she / forgotten / might / have / her / homework)
She might have forgotten her homework.
It was a bad idea not to study => I should...
I should have studied.
He ______ have taken your phone — it's in his bag now.
must
She (must/ could) be at home right now, because her car is in the driveway.
must
She must has forgotten her umbrella at home.
has → have
(should / studied / harder / for / have / you / the test)
You should have studied harder for the test.
I’m sure she went to the party. => SHE MUST
She must have gone to the party.
She ______ have lied to you. She’s always honest.
can’t
He (might/ can't) come to the party later, but I’m not sure
might
They can’t have saw us because we were hiding behind the wall.
saw → seen
(arrived / have / can’t / they / early / so)
They can’t have arrived so early.
It’s possible that he forgot the time. => HE MIGHT
He might have forgotten the time.
I don't know how I missed the meeting. I ______ have set the wrong alarm
might / may / could
They (couldn't/ must) be at the meeting now, because it’s already over.
couldn't
I think we might had missed the last bus.
had → have
(ought / the / to / told / truth / have / he)
He ought to have told the truth.
I’m certain that they didn’t see us. => THEY CAN'T
They can’t have seen us.
They ______ have heard us. We were whispering very quietly
can’t
should có được dùng để đưa ra suy đoán về tương lai không
có
You should have told me earlier, didn't you?
didn't => shouldn't
(missed / train / have / must / the / we / completely)
We must have completely missed the train.
It wasn’t necessary for her to bring so many clothes. => SHE NEEDN'T
She needn’t have brought so many clothes.