With a suitable modal verb. Use must, don't have to, might, should, must have,
mustn't, can't have and shouldn't.
1. You
drive on the
pavement. It's illegal.
2. You
say that. It's not
nice.
3. I
go to work
tomorrow because it's a public holiday.
4.1
buy this CD, but
I'm not sure.
5. He's not here. He
gone out.
6. She didn't study enough. She
passed her exam.
7. You
eat more
vegetables. They're good for you.
8. You
be 18 before you
can buy alcohol.
