Объяснение:
1.You could take part in this competition. Why did not you come? 2. They should have told me about this. 3. Take 2 times a day after meals. 4. The task must be completed on time. 5. The teacher understood that his students needed help. 6. You should hurry: the hall should be ready for the concert. 7. No need to talk about it again.
