GIÚP mik vs Giải thích giùm mik lun nha ...tại sao lm như zị á C. MODAL VERBS. 1. ……………..you swim when you were 10 years old?( Could / Can / Must ? May ) 2. I ……..understand why he failed the exam . He is the best student in our calss. ( don’t have to / needn’t / can’t ) 3. You ………….shout. I am not deaf.( mustn’t / needn’t / can’t / don’t have to) 4. This is a non-smoking room. You……smoke in here .( need/ needn’t / must / mustn’t ) 5. To enter the USA, you ……………..get a visa.( must / should / ought to / need) 6. You …………..keep it secret or they’ll kill you.( must / can / may / need) 7. Bring your jacket with you. It ………………get cold in the everning.( can / may / must / would) 8. You …………..read that article if you don’t want to.( haven’t / may not / needn’t / mustn’t) 9. I can’t find my key anywhere. I …………….have left it on the train. I am not sure.( must / might / should / can) 10. You……………..forget to learn the lesson by heart. The new teacher is so strict.( needn’t / mustn’t / mayn’t ) 11. If there is anything you…………… . Let me know. ( must / should / need / may) 12. They …………be away fot the weekend, but I am not sure. ( might/ can / must / should) 13. You…………….. leave now if you want. ( must / may / need / can ) 14. ………………you open the door ,please? It is so hot in here.( May / Could / Might ? Need) 15. You ……………….go to the shop. I have already bought the milk.( mustn’t / needn’t / can’t /shouldn’t)