Відповіді: Стр.60 (3)

3. Complete the second example in each pair of sentences so that it means the same as the first. What do the examples tell you about the meaning of unless?

1. Unless we do more to help orangutans, they will disappear completely. If we don't do more to help orangutans, they will disappear completely.

2. Unless we protect the rainforests, many species will lose their habitat. If we don't protect the rainforests, many species will lose their habitat.