Ответ:

1. She has to do her homtask, her mother told her

2. I have to eat my breakfast or I'll be tired all day

3. He has to clean his room or his mother will be upset

1. I mustn't talk on the lesson, it's the rule of our school

2. He mustn't walk in this zone

3. We mustn't eat anything hard because we have retainers

Объяснение:

retainers - брекети, і постав корону, будь ласка