1. People can buy the tickets online.

S + can + V1 

⇔ S + can be + V3/ed (bị động)

2. She is too short to reach the top of the wardrobe.

S + be + so  + ADJ + that + clause:

⇔ S + be + too + ADJ + (for O) + to V: quá... đến nỗi không

3. Peter and Mark play soccer very excellently.

S số nhiều + are + ADJ + N số nhiều 

⇔ S + V + ADV

4. Tom asked Jane if she could help him with his pronunciation.

S + asked / wanted to know / wondered + (O) + if/whether + S+ V (lùi thì)

can --> could 

5. She speaks English very well.

S số ít + is + a/an + ADJ + N số ít 

⇔ S + V + ADV

6. Climbing high mountains alone in the winter isn't safe.

It's + ADJ+  to V 

⇔ Ving ..+ be + ADJ 

7. Tom has learnt English since 1990.

S + started / began + to V / Ving

⇔ S + has/have+ V3/ed + for/since + time 

8. He hasn't met my sister since last summer.

S + last + V2/ed+ time

⇔ S + has/have+ not + V3/ed + for/since + time 

9. Ho Chi Minh City is bigger than Hue.

S + be + (not) + as+ ADJ + as+ O : so sánh bằng

⇔ S + be + ADJ-er + than + O : so sánh hơn 

10. When did you study medicine?

How long + has/have+ S+ V3/ed ?

⇔ When + did +S + V1?

`color{orange}{~LeAiFuRuiHuiBao~}`