Grammar: can/could/may/will/would Can/could/may I help you?
Can/could/may I use the phone?
Can/could/may I have some water?
Can/could/will/would yuo take out the rubbish?
should/could
We should/could have a go at playing beach volleyball - it looks like a lot of fun! You should /could look up the word in the dictionary.
must/have to/need( to) can't
I must /have to be home by six o'clock.I need to make a phone call.
You mustn't/can't walk on the grass. Look at the sign!
You don't have to/ don't need to/ needn't cook tonight. We're going out.