Must Can May Should Could Had To

to be able to =

• can
• may
• must

to be allowed to =

• can
• may
• must

to have to =

• can
• may
• must

I'm not allowed to.

• I musn't.

• I needn't.

We've prepared a lot of snacks, so you ____ bring any food.

• musn't
• needn't

You ____ go swimming too soon after eating. It's not good for you.

• shouldn't
• needn't
• couldn't

Dad ____ fix it before mom came home.

• able to
• allowed to
• had to

It was a big problem, but we were ____ to solve it in only 20 minutes.

• able
• allowed
• had

When I was younger, I wasn't ____ to watch horror movies.

• able
• allowed

I already knew all the words, so I didn't ____ to spend much time studying vocab.

• able
• must
• have