Ex 4: Find a mistake in each sentence and then correct it.
5. Mike said that he has to postpone his visit to the dentist.
6. Villagers were evacuated before the storm arrived.
7. Do you want to be tell what to do?
8. That river is too dirty for us to swim in it.
9. We had lived there since ten years before moving to our present house.
10. Lots of aquatic animals have dead because of oil spills.
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