Надо.
выберете правильный вариант ответа:
1.if we were careful, we among litter and wastes.
1)don't live
2)won't live
3) wouldn't live
4) wouldn't have lived
2. if we planted more forests, we wild animals.
1)save
2) would save
3)will save
4) would have save
3. she said "i have been waiting for you since five o'clock." she said that she for me since five o'clock.
1)have been waiting
2)had been waiting
3)has been waiting
4) will have waited
5)was waiting