Ability/ Probability
Possibility / Request
Obligation / Prohibition
100
Five years ago, I (cannot, couldn't) play the piano.
Five years ago, I couldn't play the piano.
100
When I grow up, I (may, might) become an engineer.
When I grow up, I may become an engineer.
100
We have enough milk in the fridge so we (must, mustn't, needn't) buy some more.
We have enough milk in the fridge so we needn't buy some more.
200
We (can, could) speak English well.
We can speak English well.
200
(Might, May) I have a glass of water?
May I have a glass of water?
200
Time is not on our side. We (must, mustn't, needn't) hurry.
Time is not on our side. We must hurry.
300

The volleyball team (must, 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.

300
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.
300
Mary gave me a letter to send. I (must, mustn't, needn't) forget to mail it.
Mary gave me a letter to send. I mustn't forget to mail it.
400
I (cannot, couldn't) run that fast when I was six years old.
I couldn't run that fast when I was six years old.
400

If you leave the stove on, the house (may, might) catch on fire.

If you leave the stove on, the house may catch on fire.

400
You (must, mustn't, needn't) wash those carrots. They've already been washed.
You needn't wash those carrots. They've already been washed.
500
I think I (can, could) help you learn math if you study hard.
I think I can help you learn math if you study hard.
500
Billy and I (may, might) cook dinner tonight.
Billy and I may cook dinner tonight.
500
He will be having lessons for another two hours. We (must, mustn't, needn't) visit him now.
He will be having lessons for another two hours. We mustn't visit him now.
M
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