Ex.

-  Could you/Can you    please turn that stereo down?

-I'm sorry, but I  (negative modal)--> can't /can­not  hear you.

asking favor

ability

1.

- (I/stop)                       smoking doc­tor?

-No, but if you don't stop you                      die.

obligation

possibi­lity

2.

It's going to be minus 20 tonight so you

                       plug in the car heater.

advice

3.

That job is only open to university graduates.  You  __________                 have at least a bachelor's degree to apply.

obligation

4.

I can stay in bed tomorrow because I (nega­tive modal)                  work.

no necessity

5.

-                   borrow your car this week­end?

-No because I                 need it if I go shop­ping.

per­mission

possibility

6.

                     fasten your seatbelt?  I don't want to get a traffic ticket.

asking favor

7.

He doesn't sing very well now, but he                sing beautifully when he was a child.

past ability

8.

-                help you, madam?

-Yes, it is my daughter's birthday and I             find a present.

po­l­ite request

obligation

9.

It                       rain, but I doubt it.

possibility

10.

Why are you in a hurry?  We (negative modal)       leave until ten o'clock and it's only 9:30.

no necessity

11.

Whatever you do, you (negative modal)              press that button.  If you push it, the entire planet                    explode.

prohibition

possibility

12.

-I                   write English well, but I have trouble speaking....

-You                     find yourself an English girlfriend...that way you'll improve quick enough!

ability

advice

13.

-                     hold the baby?

-O.K., but you (negative modal)          drop him!

per­mission

warning

14.

You (negative modal)          eat those mush­rooms; they                           be poison­ous.

advice

possibility

15.

You                          remove your clothes; this beach is reserved for nudists.

strong advice