Ребят очень нужна помощь
Исправьте ошибки в предложениях,но есть такие,в которых всё правильно

1. He can speak French.
2. He doesn`t know German.
3. They live in China.
4. She didn`t know this man.
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6. The children aren`t sleeping, are they?
7. He can play computer games.
8. We don`t know him.
9. She sends him e-mails every day.
10. Did Robin write a letter to his friends?
11. If Masha doesn`t help Robin, Robin won`t go back to his time. 
12. There is much salt in the soup.
13. Everybody likes to swim in the sea.
14. You had to help her, had not you?
15. His grandfather was the old brave man.
16. They will go to the Black Sea next year.
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18. I saw him at 6 o`clock yesterday.
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21. Have you ever seen the Tsar Bell?
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