MODAL VERBS

She might have been feeling ill.

• It’s possible that she is feeling ill.

• B It’s possible that she was feeling ill.

Answer explanation

This sentences is describing a speculation in the past.

You must be tired after all that work.

• I’m sure you are tired.

• I’m sure you were tired.

Answer explanation

This is a speculation in present.

George could have gone home early.

• It’s possible that he will go home early

• It’s possible that he went home early.

Answer explanation

This is a speculation in the past, not the future.

You should have been more careful.

• I advise you to be more careful in the future.

• You weren’t careful enough.

Answer explanation

This is expressing a regret from the past.

You could make more effort to help.

• You didn’t do enough to help.

• You don’t do enough to help.

Answer explanation

This is describing a situation in the present.

could + infinivite verb= modals in present.

It can’t have been much fun!

• I'm sure you didn’t enjoy it!

• I don’t think you would enjoy it!

Answer explanation

This is a negative speculation about something in the past.

Tell us about your regrets or mistakes you’ve made.

I once saw a guy fall off his bike in the street. I was in a hurry, so I just carried on. I 

______ ____ ____ (should/do) something to help him.

Answer explanation

This sentence expresses a regret from the past.

should + have + past participle

My tablet went missing from my bedroom a couple of weeks ago. I thought someone ____ ____ ______ (must/steal) it, so I called the police.

Answer explanation

This person is basically 100% certain of their theory.

I _______ ____ _______ (need/worry). My brother had borrowed my phone. I thought I had lost it.

Answer explanation

This sentence expressions something that wasn't necessary in the past.

I once missed an exam because I overslept. I ____ ____ ____ ________ (must/sleep) very deeply because I didn’t hear my alarm go off.

Answer explanation

This is a speculation about an ongoing action in the past.