Can (ability in the present): Birds can fly.
Can't ( Lack of ability): Birds can't fly.
Can- request: Can you pass me the salt, please?
Can/Could/May/Might I...? = Do you...?
Would you mind if...?
Asking Permission: Can I go swimming today, mom?
Giving/Refusing Permission
Can-May= You are allowed to do sth.
You can't go out tonight but you can go out tomorrow.
You can't make up.= You arenot allowed to make up. = You can't wear make up at school.
OFFER:
Can I / Could I/ Shall I/ Would you like me to do...?
Can I get you anything from the supermarket?
Shall I carry the bags for you?
COULD (Past Ability):
I could write and read when I was 5 years old.
My grangmother could sing very well when she was young.
BE ABLE TO:
Present: am/is/are able to
Past: was/were able to
Future: will be able to
I can speak two languages. = I am able to speak two languages
They could run away. = They were able to run away.
We will be able to speak two more languages.
Should/Shouldn't (Advice)
Ought to (=should)
Had better (stronger than should)
We should practise a lot.
You should tell the truth.
I have a headache. What should I do?
You had better be more careful.
MUST ( strong advice ): You must talk to your lawyer.
Have to / Don't or Doesn't have to: You have to go home.
Must-It's almost certain:
He must be John's brother. He is very tall, too.
I had to go out late last night because we didn't have any bread. (Past Form)
I didn't have to finish homework yesterday.
MUSN'T (Prohibition):
You musn't to park here. = You're not allowed to park here.
It's forbidden...= It's illegal = It's againt to law to park here.
YOUR TURN: Don't drink that water.(must)
must...
can...
forbidden...
illegal...
againts...
allowed...
