Complete the sentences with the first conditional form of the verbs in brackets. Then rewrite sentences 4 - 5 using if.
If we (survive), our brains (get) bigger.
→ If we survive, our brains will get bigger.
1. If people ______ (live) on other planets, they ________ (miss) the Earth.
2. He ________ (get tired) if he __________ (not rest).
3. We ________ (not look) the same if we _________ (live) on Mars.
4. You _________ (miss) the bus unless you ________ (get up) now.
5. There __________ (be) a catastrophe unless we ___________ (protect) the environment.
1. live/ will miss
2. will get tired/ doesn't rest
3. won't look/ live
4. will miss/ get up
5. will be/ protect
1. live / will miss
2. will get tired / doesn't rest
3. won't look / live
4. will miss / get up
5. will be / protect
