Modal verbs — synonyms

Copy these sentences replacing each modal verb with a synonym. Do not use contractions in this exercise. If you need help, you can refer to the modal verbs classnotes:
Example:
It could be too late to save this rainforest.
It might be too late to save this rainforest.

You ought to go to bed early today.
I must buy some milk this evening for tomorrow's breakfast.
He was not able to walk for a week after he fell off the ladder.
You cannot record anyone with your mobile phone without their permission.
You need not show me out, I know the way.
He might now know the address.
Tom said that she may not have taken the plane.
I think we should not tell the children yet.
You will need to learn English if you want to find work in London.
It could not rain this evening, there is not a single cloud in the sky and there is no wind, either.