Shall can express an order when used with second and third person pronouns.
When used with second and third person pronouns, shall can express a threat.
Shall can be used to request instruction.
Should expresses duty.
We can use can to express permission.
The expression should have is used to criticize people for not doing things.
Could indicates past ability.
Must indicates prohibition.
We use used to to talk about past habits.
Play Again!1. Would you mind posting this letter for me?
2. Will you lend me your bicycle?
3. You shall not come to my door again.
4. You shall regret this.
5. What shall we do now?
6. Parents should teach their children to be honest.
7. He can take rest if he is tired.
8. You should have told me before borrowing my car.
9. The students asked if they could go home early.
10. I could run faster when I was younger.
11. You must not light a match. Gas is leaking.
12. I used to smoke before I fell ill.