III
1. do ( suggest sb ( should ) do st: gợi ý ai đó nên làm gì ) 2. going ( suggest ving: gợi ý làm gì )
3.locking ( remember ving: nhớ làm gì ) 4. choosing 5. has been sang 6. boils ( sôi ) 7. should study
8. acts 9. visits 10. have been living 11. go 12.. should be 13. saving ( help ving )
14. littering ( xả rác ) 15. treating ( look forward to ving ) 16. borrowed ( cho mượn )
III
1. it is necessary for you to attend the course
2. you should turn off the volume at night
4. you must not turn that machine on
5. since ( bởi vì ) we got up late, we missed the bus
6. they failed the exam because of being so lazy
7. if you don't exercise, you ' ll have fat...
8. i suggest you should stop here