Complete the sentences with the correct tag-questions ·The Olympic Games have been held since 1896
· Mozart didn't compose this anthem,___?
· She prefers swimming n the pool,___?

"Complete the sentences with the correct tag-questions:
1) The Olympic Games have been held since 1896, haven't they?
- The correct tag-question here is 'haven't they?' because the statement is in the affirmative and we use the negative tag-question to maintain the correctness of the sentence.

2) Mozart didn't compose this anthem, did he?
- The correct tag-question here is 'did he?' because the statement is in the negative and we use the positive tag-question to maintain the correctness of the sentence.

3) She prefers swimming in the pool, doesn't she?
- The correct tag-question here is 'doesn't she?' because the statement is in the affirmative and we use the negative tag-question to maintain the correctness of the sentence.

In tag-questions, the tag is usually formed by using an auxiliary verb that matches the verb tense of the statement, followed by a personal pronoun that matches the subject of the statement. If the statement is positive, the tag-question is usually negative, and if the statement is negative, the tag-question is usually positive.

It is important to use tag-questions in order to confirm or seek agreement from the listener. They provide an opportunity for the listener to respond and express their opinion or agreement with the statement. By using tag-questions, we can engage in conversation and ensure clear communication."