Ребят помогите!!! нужно поставить время и объяснить.

1. He’s very tired. He (to try) to translate these articles all the morning.

2. If he (to be) cleverer and more persistent he (to receive) a better mark for the test.

3. Margie just called and said she would be here at 8 o’clock. By the time she gets here, we (to wait) for her for two hours.

4. The boy (to play) the violin for already two hours when his parents came back.

5. If he (to book) tickets beforehand, he (to get) much better seats.