c) Helen (to make) tea for her parents five minutes ago. d) Helen (to make) a cake for her parents in twenty minutes. e) Helen just (to make) a fruit salad for her parents. 5. a) The teacher (to write) texts for us every lesson. b) The teacher (to write) a story for us now. c) The teacher (to write) a very interest- ing essay for us at the last lesson. d) The teacher (to write) a funny text for us at the next lesson. e) The teacher (to write) a short text for us at this lesson. 6. a) We (not to buy) textbooks every month. b) We (not to buy) copybooks now. c) We (not to buy) English textbooks last week. d) We (not to buy) Russian textbooks next spring. e) We (not to buy) new textbooks yet.

Ответ: смотри решение ниже.

1. c) Helen made tea for her parents five minutes ago. (Past Simple, так как есть five minutes ago) d) Helen will make a cake for her parents in twenty minutes. (Future Simple, так как есть in twenty minutes) e) Helen has just made a fruit salad for her parents. (Present Perfect, так как есть just)
2. a) The teacher writes texts for us every lesson. (Present Simple, так как есть every lesson) b) The teacher is writing a story for us now. (Present Progressive, так как есть now) c) The teacher wrote a very interesting essay for us at the last lesson. (Past Simple, так как есть at the last lesson) d) The teacher will write a funny text for us at the next lesson. (Future Simple, так как есть at the next lesson) e) The teacher is writing a short text for us at this lesson. (Present Progressive, так как есть at this lesson)
3. a) We do not buy textbooks every month. (Present Simple, так как есть every month) b) We are not buying copybooks now. (Present Progressive, так как есть now) c) We did not buy English textbooks last week. (Past Simple, так как есть last week) d) We will not buy Russian textbooks next spring. (Future Simple, так как есть next spring) e) We have not bought new textbooks yet. (Present Perfect, так как есть yet)

Ответ: смотри решение выше.