1. I'm delighted to receive your letter

tobe delighted+ toV: hài lòng 

2. The child is not tall enough to reach the shelf

tobe adj eough+ toV: đủ để lmj

3. He is eager to comeback home at tet

tobe eager to V: háo hức làm gì

4. it's important to keep the environment clean

tobe important+ toV: quan trọng để lmj

5. She is lucky to have a lot of good friends

tobe +adj+ to+V

6. We are very happy to live together

tobe +adj+ to+V

Đáp án:

$1.$ I'm delighted to receive your letter.

`->` Be delighted to do something `:` Hài lòng, vui mừng làm gì đó

$2.$ The child is not tall enough to reach the shelf.

`->` S + be (not) + adj + enough + to do something`:`Như thế nào để làm gì đó

$3.$ He is eager to come back home at Tet.

`->` Be eager to do something `:` Háo hức, nôn náo làm gì đó

$4.$ It's important to keep the environment clean.

`->` Be important to do something `:` Quan trọng làm gì đó

$5.$ She is lucky to have a lot of good friends.

`->` Be lucky to do something `:` May mắn làm gì đó

$6.$ We are very happy to live together.

`->` Be happy to do something `:` Hạnh phúc làm gì đó

`----------------`

`-` Cấu trúc chung `:` S + be + adj + to do something - Như thế nào làm gì đó

`->` Công thức thì HTĐ - Động từ tobe `:`

`( + )` S + is / am / are

`( - )` S + is / am / are + not

`(  ?  )` Is / Am / Are + S ?