Ответ:

1) We (to play) chess with Tomas yesterday.

2) Natalie (to stay) at the hotel.

3) She (not to know) my address.

4) They (to see) something interesting.

5) I (not to understand) those words.

6) You (to hear) the order.

7) Our parents (not to trust) doctors.

8) Helen (to have) an idea.

Объяснение: