ACTIVE AND PASSIVE
VOICE WITH MODALS
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CAN / CAN'T (CAN NOT)
Active: Passive:
Mike can foretell the future. The future can be foretold by Mike.
Terry can't foretell the future. The future can't be foretold by Terry.
MAY / MAY NOT
Active: Passive:
James may buy a new car. A new car may be bought by James.
You may not drink that beer. That beer may not be drunk by you.
MIGHT / MIGHT NOT
Active: Passive:
James might buy a new car. A new car might be bought by James.
James might not rent a car. A car might not be rented by James.
SHOULD / SHOULDN'T
Active: Passive:
Students should do homeworks. Homeworks should be done by students.
Children shouldn't smoke cigarettes. Cigarettes shouldn’t be smoked by children.
OUGHT TO
Active: Passive:
Students ought to do homeworks. Homeworks ought to be done by students.
We ought not to smoke cigarettes. Cigarettes ought not to be smoked by us.
(negative ought to is rarely used)
HAD BETTER / HAD BETTER NOT
Active: Passive:
Students had better practice English. English had better be practiced by students.
A child had better not drink whiskey. Whiskey had better not be drunk by a child.
MUST / MUST NOT
Active: Passive:
Everybody must say the truth. The truth must be said by every body.
Customers must not use that door. That door must not be used by customers.
HAS TO / HAVE TO / DOESN'T HAVE TO/ DON'T HAVE TO
Active: Passive:
She has to wash the floor. The floor has to be washed by her.
They have to wash the dishes. The dishes have to be washed by them.
Maria doesn't have to clean the yard. The yard doesn’t have to be cleaned by Maria.
I don't have to mop the rooms. The rooms don’t have to be mopped by me.
EXERCISE 1. Change the following sentences: active / passive.
1. Children must obey their parents. __________________________________
2. Montoya might win the race this year. __________________________________
3. Animals shouldn’t be caught by men. __________________________________
4. You may pass this course easily. __________________________________
5. A computer can process a lot of information.__________________________________
6. We must eat fruits. __________________________________
7. People and animals have to drink water.__________________________________
8. Should I do the homework? __________________________________
9. You can understand the math problem. __________________________________
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