1 keep the neighborhood clean so as to not to cause the environmental's pollution
⇒If we keep the neighborhood clean, it won't be polluted
2 He should stop smoking
⇒He used to smoke
3 My city a lot of trees
⇒There used to be a lot of trees in my city
4 "You should stay up late, Lan"
⇒I asked Lan to go to bed early
CHÚC BẠN HỌC TỐT
CHO MIK XIN CTLHN NHA