Exercise 1. Поставьте глагол в нужную форму.
1. They (to finish) their lesson at ten о 'clock? 2. He usually (to walk) home after work. 3. He (not to work) hard at his German. 4. Whose working day (last) six hours? 5. How long your working day (to last)? 6. This engineer usually (to return) home at seven. 7. You (to answer) many question at yourlessons? 8. Your sister often (to stay) at the factory after work? 9. I often (to receive) letters from my friends. 10. My friend often (to answer) many letters and telegrams. 11. Who often (to discuss) many questions with us? 12. How they (to know) English ? 13. They ( know ) English very well .