1 Why should we avoid using our cars? 2 What means of transport are less harmful to the environment? 3 What can we do if we can't use an item again? 4 Who can help you to clean up your neighbourhood? 5 Why are trees important?​

1. She has read (read) a lot of books last year. (сигнальное слово last year – Past Simple)
2.We didnt go (haven't gone) to the theatre this month. (сигнальное слово this month – Present Perfect)
3. Did you have (Have you had) holiday this year?— Not yet. (сигнальное слово this year – Present Perfect)
4. What are your plans for summer? — I didnt think (haven't thought) about it yet. (сигнальное слово not yet – Present Perfect)
5. We've discussed (discussed) some of these problems last time. (сигнальное слово last – Past Simple)
6. When have you bought (did you buy) this car? — Two years ago. (с вопросом When? – всегда Past Smple)

1. She has read (read) a lot of books last year. (сигнальное слово last year – Past Simple)
2.We didnt go (haven't gone) to the theatre this month. (сигнальное слово this month – Present Perfect)
3. Did you have (Have you had) holiday this year?— Not yet. (сигнальное слово this year – Present Perfect)
4. What are your plans for summer? — I didnt think (haven't thought) about it yet. (сигнальное слово not yet – Present Perfect)
5. We've discussed (discussed) some of these problems last time. (сигнальное слово last – Past Simple)
6. When have you bought (did you buy) this car? — Two years ago. (с вопросом When? – всегда Past Smple)