`2:` More trees should be planted to protect the environment.
`3 : ` In spite of the fact that the government has invested a lot, the air pollution is still a major concern.
`→` Although + S + V, S + V = In spite of/ Despite + the fact that + S + V, S + V: mặc dù ... nhưng ...
`3 :`My teacher delivered the grammar lesson.
Cấu trúc câu bị động thì QK đơn
S + Vpast + O
`→ ` S + was V2 + (by O)
`4:` Do you still remember the day when we first met ?
`→`N (time) + When + S + V …