1. Bob used to smoke a lot but now she doesn't smoke any more.

(used to + V-inf)

2. Wearing uniforms encourages students to be proud of their school.

( encourage + O + to V: khuyến khích, khích lệ, động viên ai đó làm gì)

3. In the end, I decided not to buy that camera because it was too expensive

[decide (not) + to V: quyết định (không) làm gì]

4. He started learning play the piano when his age was 5.

(QKTD + when + QKĐ)

5. Learning a foreign language is necessary for us to get a good job.

[necessary + (for sb) + to V: ai đó cần làm gì]

$1. Bob used to smoke a lot but now she doesn't smoke any more.

`->`used to + V-inf: đã từng làm gì trong QK.

$2. Wearing uniforms encourages students to be proud of their school.

`->`encourage + O + to V: khuyến khích, động viên ai đó làm gì

$3$. In the end, I decided not to buy that camera because it was too expensive

`->`decide ( not ) + to V: quyết định ( không ) làm gì

$4$. He started learning play the piano when his age was 5.

`->`QKTD + when + QKD

`->`start + V-ing: bắt đầu làm việc gì đó

$5$. Learning a foreign language is necessary for us to get a good job.

`->`necessary + ( for sb ) + to V: ai đó cần làm gì