1.She/ is/ beautiful/ than/ more/ her sister.
-> She is more beautiful than her sister. 
2. It is compulsory for us to wear uniform when you are at school
-> We must  wear uniform when we are at school.
3. Remember to wear your helmet.
->You must wear your helmet.
4. Your English / good/ my English
-> Your English is better than my English.
5. Quang sits in front of Minh
->Minh sits behind Quang.
6.There are twenty classes in our school.
-> Our school has twenty classes.
7.me/ Excuse. tell/ Could / the/ you/ the/ cinema/ way/to/ me, please?
-> Excuse me. Could you tell me the way to the cinema, please?
8. "Excuse me! Where is the nearest bus stop?"
-> "Excuse me! Can you tell me the way to the nearest bus stop?
9. Ho Chi Minh city is bigger than Ha Noi city.
-> Ha Noi city is smaller than Ho Chi Minh city.
10.Summer / hot/ winter.
-> Summer is hotter than winter.