Ability (能力)
Five years ago, I (can't, couldn't) play the piano.
couldn't
When I grow up, I (will, might) become an engineer.
might
I think I (will, would) go to the beach this Sunday.
will
We have enough milk in the fridge so we (must, mustn't, needn't) buy some more.
needn't
We (can, could) speak English well.
can
(Might, May) I have a glass of water?
May
I am feeling tired. I think I (would, will) go to sleep now.
will
Time is not on our side. We (must, mustn't, needn't) hurry.
must
The volleyball team (can, could) go to the Olympics this year if they are lucky.
could
There is a small chance that we (shan't, might) go to the beach this weekend.
might
I (will, would) try to act like my father when I was young.
would
Mary gave me a letter to send. I (must, mustn't, needn't) forget to mail it.
mustn't
I (can't, couldn't) run that fast when I was six years old.
couldn't
If you leave the stove on, the house (may, should) catch on fire.
may
If you get in trouble, I (won't wouldn't) help you.
won't
You (must, mustn't, needn't) wash those carrots. They've already been washed.
needn't
I think I (can, could) help you learn math if you study hard.
can
Billy and I (may, must) cook dinner tonight.
may
(Will, Would) you like steak or chicken?
Would
He will be having lessons for another two hours. We (must, mustn't, needn't) visit him now.
mustn't