1. Make the sentences interrogative and negative: 6. Jane has made a lot of mistakes in her dictation. 7. We have met him before. 8. The rain has stopped. 9. Our teacher has just returned from London. 10. I have been there very often.

Но это же русский

Объяснение:

1. To make a sentence interrogative and negative, first, we need to add the helping verb "do" or "does" before the main verb. Then, we add the word "not" after the helping verb. Finally, we change the word order so that the helping verb is before the subject.

First sentence: Jane has made a lot of mistakes in her dictation.
Interrogative: Has Jane not made a lot of mistakes in her dictation?
Explanation: We added "Has" before "Jane" to make it interrogative. Then, we added "not" after "has" to make it negative.

Second sentence: We have met him before.
Interrogative: Have we not met him before?
Explanation: We added "Have" before "we" to make it interrogative. Then, we added "not" after "have" to make it negative.

Third sentence: The rain has stopped.
Interrogative: Has the rain not stopped?
Explanation: We added "Has" before "the rain" to make it interrogative. Then, we added "not" after "has" to make it negative.

Fourth sentence: Our teacher has just returned from London.
Interrogative: Has our teacher not just returned from London?
Explanation: We added "Has" before "our teacher" to make it interrogative. Then, we added "not" after "has" to make it negative.

Fifth sentence: I have been there very often.
Interrogative: Have I not been there very often?
Explanation: We added "Have" before "I" to make it interrogative. Then, we added "not" after "have" to make it negative.

In summary, to make a sentence interrogative and negative, we add a helping verb and "not" before the main verb and change the word order. This helps us ask a question and express a negative statement.