Task №1 Mustn't and don't have to 1. She leave home at eight every morning. 2. You come to work in time. 3. English children stay at school till the age of 16. 4. The buses were all full; I get a taxi. 5. Tell her that she be here by six. I insist on it. 6. He felt ill and leave early.

Task №1 - Mustn't and don't have to

1. She mustn't leave home at eight every morning.
Explanation: "Mustn't" is used to express prohibition or something that is not allowed. In this case, it means that she is not allowed to leave home at eight every morning.

2. You don't have to come to work in time.
Explanation: "Don't have to" is used to express lack of obligation or necessity. In this case, it means that there is no obligation for you to come to work on time.

3. English children don't have to stay at school till the age of 16.
Explanation: Again, "don't have to" is used to express lack of obligation or necessity. In this case, it means that English children are not required to stay at school until the age of 16.

4. The buses were all full; I had to get a taxi.
Explanation: "Had to" is used to indicate an obligation or necessity. In this case, it means that the buses were full, so there was no other choice but to get a taxi.

5. Tell her that she must be here by six. I insist on it.
Explanation: "Must" is used to express strong obligation or necessity. In this case, it means that there is a strong obligation for her to be here by six, and the speaker insists on it.

6. He felt ill and didn't have to leave early.
Explanation: "Didn't have to" is used to express lack of obligation or necessity. In this case, it means that he was not required to leave early even though he felt ill.