Напишите следующие предложения в вопросительной и отрицательной формах:
Образец: They are working.
Are they working?
They aren't working.
2. He is looking for the book which he lost.
4. The sky is getting very dark,
5. They are laughing at what you said.

Is he looking for the book which he lost?He is not looking for the book which he lost.Is the sky getting very dark?The sky is not getting dark.Are they laughing at what you said?They are not laughing at what you said.