37. Don't walk on the street. Walk on the pavement.

38. If I had wings, it would be very interesting.

Câu điều kiện loại 2 : Diễn tả những thứ không có thật, không tồn tại.

If + S + Ved/PI -> mệnh đề If

S + would, could, might, should + (be) + Vo/adj

39. The teacher asked the students what they were doing then.

S + asked + O + wh-questions + S + V (lùi thì) + thời gian. (now=>then)

40. I was tired, so I went home early.

37. Don't walk on the street. Walk on the pavement.

V1 / Don't + V1 

--> câu mệnh lệnh 

38. If I had wings, it would be very interesting. 

If 2: if + QKĐ, S + would / could + V1 

39. The teacher asked the students what they were doing then.

S + asked + O + Wh +S+  V (lùi thì)

HTTD --> QKTD

now --> then 

40. I was tired so I went home early. 

Clause + so + clause: vì vậy 

be +adj 

v +adv 

`color{orange}{~MiaMB~}`