modal helping verbs 1

*Permission

You can open the window if you want.

You may answer the phone if it's an emergency.

Could I use your book, please?

Might I borrow your umbrella?

*Obligation

I must finish this report before noon.

You mustn't park your car here.

*Intention

They will give our money back.

I shadn't stay long.

I tried to explain, but nobody would listen

*Ability

Tom can speak Italian.

I can't find my book.

I arrived late because I couldn't catch the bus.