СРОЧНО: впр.3 с 158 ( вибрати правильну форму дієслова)

Ответ:

1. If we don't have enough water, we will be thirsty. (simple present, future)
2. More species will survive if we protect nature. (simple future, simple present)
3. We would reduce the use of natural resources if we recycled old and used things. (conditional, simple past)
4. Clean water would not be a problem if people stopped throwing rubbish into the seas and rivers. (conditional, past participle)
5. Many animals and plants would not be in danger if we stopped killing the animals and didn't cut down the trees. (conditional, past participle, past participle)