| Will |
(in
future tense)
(in requests) |
I
will be there.
Will you do it for me? |
| Won't
|
(negative
of will) |
No,
I won't. |
| Can
|
(to
indicate ability)
(in requests)
(informally to ask permission) |
I
can do it.
Can you help me?
Can I use your phone? |
| Can't |
(negative form of can) |
No,
you can't |
| May |
(to indicate possibility)
(to ask permission) |
I may go to New York.
May I help you? |
| Could |
(to indicate past ability)
(to indicate possibility)
(in requests)
(to ask permission) |
He
could play cards well.
I could give you a ride.
Could you open the door please?
Could I use your restroom? |
| Couldn't |
(negative past tense) |
I
couldn't help it. |
| Should
|
(to
express obligation)
(to conjecture) . |
I
should go to the wedding.
He should be in Miami by now |
| Shouldn't |
(negative suggestions) |
You
shouldn't do that. |