Ability
Obligation
Necessity/Isistence
Possibility
Permission/Requests
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, maybe) become an engineer.

When I grow up, I may become an engineer.

100
I think I (will, would) go to the beach this Sunday.
I think I will go to the beach this Sunday.
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.
100

You (might, may) go to the bathroom if you ask permission.

You may go to the bathroom if you ask permission.

200
We (can, could) speak English well.
We can speak English well.
200

(Can, May) I have a glass of water?

May I have a glass of water?

200
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.
200
Time is not on our side. We (must, mustn't, needn't) hurry.
Time is not on our side. We must hurry.
200

(May, Will) I borrow a pencil?

May I borrow a pencil?

300
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.
300

There is a small chance that we (maybe, might) go to the beach this weekend.

There is a small chance that we might go to the beach this weekend.

300
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.
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.
300

(Will, would) you help an old lady cross the street if she asked you?

Would you help an old lady cross the street if she asked you?

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 (can, might) catch on fire.

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

400
If you get in trouble, I (won't wouldn't) help you.
If you get in trouble, I won't help you.
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.
400

(Would, Won't) you tell the band to stop playing the music so loudly? 

Would you tell the band to stop playing the music so loudly?

500

You(can, could) have been a better student if you studied harder.

You could have been a better student if you studied harder.

500

Billy and I (possibly, may) cook dinner tonight.

Billy and I may cook dinner tonight.

500
(Will, Would) you like steak or chicken?
Would you like steak or chicken?
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.

500

It (would, will) be great if you could come to the party!

It would be great if you could come to the party!