Đáp án:

56. It's important to keep the environment clean.

giải thích : It's + be + tính từ (adj) + ( For O) + to inf

57. How about planting some trees around your house ?

giải thích : How about + V-ing

58. The girl who lives next door to us is very friendly.

giải thích : Danh từ người + Who + V

59. Mr.Minh asked me what my name was.

60. It is necessary to learn English.

61. In spite of his broken leg, he managed to get out of the car . 

giải thích : In spite of + N phase / V-ing

N phase : a/an/the/this/that

                his/her/my/your 

`56.` It's very important to keep the environment clean.

`-` V-ing + O + tobe + adj

`->` It + tobe + adj + to V + O

`57.` How about planting some trees around your house?

`-` Why don't we/ you + V(bare)?

`->` How about + V-ing?

`58.` The girl who lives next door to us is very friendly.

`-` ĐTQH: who `->` thay thế cho danh từ chỉ người làm chủ ngữ

`-` Cấu trúc: N (person) + who + V (chia) + O

`59.` Mr. Minh asked me what my name was.

`-` Câu tường thuật: Dạng WH-questions: S + asked sb/ wondered/ wanted to know + WH-words + S + V(lùi thì)

`-` Đổi TTSH: your `->` my

`-` Lùi thì của động từ: HTĐ `->` QKĐ 

`60.` It is very necessary to learn English.

`-` V-ing + O + tobe + adj

`->` It + tobe + adj + to V + O

`61.` In spite of his broken leg, he managed to get out of the car. 

`-` Although + Clause 1 (S + V + O), Clause 2 (S + V + O)

`->` In spite of + N/N phrase/V-ing, Clause 2 (S + V + O): Mặc dù