can, could
Five years ago, I (cannot/couldn't) play the piano.
Five years ago, I couldn't play the piano.
When I grow up, I (may/might) become an engineer.
When I grow up, I may become an engineer.
I think I (will/would) go to the beach this Sunday.
I think I will go to the beach this Sunday.
We have enough milk in the fridge so we (must not, don't need to) buy some more.
We have enough milk in the fridge so we (don't need to) buy some more.
(Could/Might) I play some music?
Could I play some music?
We (can/could) speak English well.
We can speak English well.
(Might/May) I have a glass of water?
May I have a glass of water?
I am feeling tired. I think I (would/will) go to sleep now.
I am feeling tired. I think I will go to sleep now.
Time is not on our side. We (must/need) hurry up.
Time is not on our side. We must hurry up.
(Could/Must) I have another coffee?
Could I have another coffee?
When grandpa was young, he (can, could) play golf very well.
When grandpa was young, he could play golf very well.
There is a small chance that we (may/might) go to the beach this weekend.
There is a small chance that we might go to the beach this weekend.
I (will/would) try to act like my father when I was young.
I would try to act like my father when I was young.
Mary gave me a letter to send. I (mustn't/needn't) forget to mail it.
Mary gave me a letter to send. I mustn't forget to mail it.
It (might/should/shouldn't) rain this evening.
It might rain this evening.
I (can't/couldn't) run that fast when I was six years old.
I couldn't run that fast when I was six years old.
If you leave the stove on, the house (may/might) catch on fire.
If you leave the stove on, the house might catch on fire.
If I were you, I (will not, wouldn't) go out with this person.
If I were you, I wouldn't go out with this person.
You (mustn't/don't need to) wash those carrots. They've already been washed.
You don't need to wash those carrots. They've already been washed.
I (must/musn't/may) finish the report today.
I must finish the report today.
The volleyball team (can/could) go to the Olympics this year if they are lucky.
The volleyball team could go to the Olympics this year if they are lucky.
Billy and I (may/might) cook dinner tonight.
Billy and I may cook dinner tonight.
(Will/Would) you like steak or chicken?
Would you like steak or chicken?
He will be having lessons for another two hours. We (must/mustn't/need to/don't need to) visit him now.
He will be having lessons for another two hours. We mustn't visit him now.
Every car (must/could/couldn't) have seat belts.
Every car must have seat belts.