Write first conditional sentences. Then decide in which of them you could use unless. (Viết câu điều kiện loại 1. Rồi hãy quyết định bạn có thể sử dụng unless ở câu nào.)

0. environment / suffer / if / we not recycle more
The environment will suffer if we don’ t recycle more. The environment will suffer unless we recycle more.
1. if / I give this phone / charity / they find someone who needs it