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1. Her mother wrote a sick note for her
(-) Her mother did not write a sick note for her.
(?) Did her mother write a sick note her?
2. Nam was absent from school yesterday.
(-) Nam was not absent from school yesterday.
(?) Was Nam absent from school yesterday?
3. I had a bad cold two days ago.
(-) I did not have a bad cold two days ago.
(?) Did you have a bad cold two days ago?
4. Many students caught flu last month.
(-) Many students did not catch flu last month.
(?) Did many students catch flu last month?
5. They were happy with their life.
(-) They weren’t happy with their life.
(?) Were they happy with their life?
6. He suggested going out for dinner.
(-) He didn’t suggest going out for dinner.
(?) Did he suggest going out for dinner?
7. I was busy last Sunday.
(-) I wasn’t busy last Sunday.
(?) Were you busy last Sunday?
8. We enjoyed our summer vacation
(-) We did not enjoy our summer vacation.
(?) Did you enjoy your summer vacation
1must
2musn't-don't have to
3don't have to-have to
4don't have to-must
5don't have to-have to
6must-must
have to
musn't
have to
have to
don't have to
have to
musn't
don't have to
have to
have to
have to
Phát âm /s/ khi tận cùng từ bằng p, k, t, f,th
Phát âm /iz/ khi tận cùng từ bằng s,ss,ch,sh,x,z,o,ge,ce
Phát âm /z/ đối với những từ còn lại