Why didn’t you help him? You ___ have done it.
In California, you ___ have a driver's license to drive a car.
A: ___ I phone you tonight?
B: Yes, you ___ .
While you are driving, you ___ listen to the radio. It's not necessary.
But I ___ stay in England for six months, and not for a fortnight as I had planned.
If you plan to take a long trip in the car, you ___ get a full tank of gas or you might run out of gas!
I ___ draw a circle with a pencil only, and you? Neither can I.
When you are putting gasoline in your gas tank, you ___ smoke! It is forbidden.
Last week I ___ go to town on business trip as the Ministry of Education had asked me to come.
It's not a good idea to talk on a cell phone and drive at the same time. Drivers ___ do that.