Люди помогите английский вообщем не разумею , а у меня завтра

1. They said, "This is our book." They said that was their book
2. She said, "I went to the cinema yesterday."She said she had gone to the cinema the day before.
3. He said, "I am writing a test tomorrow."He said that he was writing a test the next day.
4. You said, "I will do this for him."You said that you would do that for him
5. She said, "I am not hungry now."She said that she was not hungry then.
6. They said, "We have never been here before."They said that they had never been there before.
7. They said, "We were in London last week."They said that they had been in London the previous week
8. He said, "I will have finished this paper by tomorrow."He said that he would have finished that paper by the next day.
9. He said, "They won't sleep."He said that they wouldn't sleep.
10. She said, "It is very quiet here."She said that it was very quiet there.
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It was their book. She had gone... He was writing a test the next day. You would do... She wasn't... They had never been... They had been... He would have finished... They wouldn't sleep... It was very quiet...