F. Rewrite the sentences using the words given.
1. It isn't necessary for you to buy me a gift.
You___ don't
2. It's better if you apologise to your brother
You should
3. It is necessary for everyone to bring a packed lunch.
You must
4. They weren't able to train because it was raining.
They could
1. You don't need to buy me a gift.
2. You should apologise to your brother.
3. You must bring a packed lunch.
4. They could not train because of the rain.
Объяснение: