1) If we have enough water, we won't be thirsty.
2) More species will survive if we protect nature.
3) We will reduce the use of natural resources if we recycle old and used things.
4) Clean water won't be a problem if people stop throwing rubbish into the seas and rivers.
5) Many animals and plants won't be in danger if we stop killing the animals and don't cut down the trees.
1 have, won't
2 will survive, protect
3 will reduce, recycle
4 won't be, stop
5 won't be in danger, stop, don't cut down
