51. Open the brackets. Put the verbs into the Present Indefinite, the Present Continuous, the Past Indefinite, or the Future Indefinite.
1. Which of your friends (to skate) at the stadium last winter?
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2. How often they (to drink) coffee?
3. Why he (to come) home at 6 o'clock yes-terday?
4. His mother (to help) him with his home¬work every day.
5. Mr. Smith (to go) to the stadium now.
6. What Sally (to buy) at the shop now?
7. Why she (not to knit) her cap the day before yesterday?
8. You (to drink) tea in twenty minutes?
9. What Granny (to cook) for dinner yes-terday