1. Traveling around the city in a day is impossible.

->it's impossible to travel around the city in a day

2.

Answer : A letter was sent to my friend in New York two weeks ago

- Câu bị động có 2 chủ ngữ : 

Cách 1 : S + be + Ved/V3 + giới từ + sb + (by O)

Cách 2 : S + be + Ved/V3 + sth + (by O ) 

- Câu bị động của thì Quá Khứ Đơn : 

+) S + was/were + Ved/V3 + ( by O ) 

-) S + was/were + not + Ved/V3 + ( by O ) 

?) Was/were + S + Ved/V3 + ( by O ) ? 

- A letter thuộc số ít nên chia was  

3.

Can I smoke here? -->Would you mind smoking a cigarette here?

$3.$ Traveling around this city in a day is impossible

--> Is it impossible to travel around this city in a day?

$-$ Ta có cấu trúc:

$⇒$ Possible/ Impossible+ to V: Có/ Không có khả năng làm việc gì

$4.$ I sent my friend a letter in New York two weeks ago.

--> A letter was sent in New York two weeks ago

$-$ Ta có thể bị động thì QKĐ:

$⇒$ S+ was/ were+ V-ed/ PII (+ by O)

$5.$ Can I smoke here?

--> Would you mind if I smoked here?

$-$ Ta có cấu trúc:

$⇒$ Would you mind if S+ V-ed?

$#Jade$