Tham khảo
1 if / burn rubbish, /produce harmful smoke .
⇒⇒If you burn rubbish, you will produce harmful smoke.
2 if / reuse bottles, /save a lot of money.
⇒⇒If you reuse these bottles , you will save a lot of money.
3 if/use recy cled paper , /save/trees.
⇒⇒If student use recycled paper,they will save a lot of trees.
4 if / plant trees in the schoolyard,/school/greener place.
⇒⇒If student plant trees in the schoolyard,their school will be a greener place.
5 if / rubbish bin in every class , / classrom / cleaner.
⇒⇒If there is a rubbish bin in every class,the classroom will be cleaner.