АНГЛИЙСКИЙ,исправить ошибки в предложениях,кроме 1 и 2 предложения

Question

АНГЛИЙСКИЙ,исправить ошибки в предложениях,кроме 1 и 2 предложения

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Answer 1

3. Mary was studying when I arrived.
4. When did you send the E-mail?
5. Have you ever seen this movie?
6. When the guests arrived I had already cooked dinner.
7. I didn't understand what you said