Công thức thì QKĐ: ( + ) : S + was/ were / V (ed/ c2)...

(-) : S + was/ were + not ... // did + not + Vnt ...

(?): ( Wh) + did/ was/ were + S ..?

(-): 1, he didn't send a letter to his penpal last week

2, she didn't teach us English last year

3, they didn't do their homework carefully

4, The Pobinsons didn't buy a lot of souvenirs

5, tourists didn't eat seafood at that famous restaurant

6, the teacher didn't give her students a lot of homework

7, his uncle didn't take him to see Cham people

8, Liz didn't buy a lot of souvenirs

(?) : 1, Did he send a letter to his penpal last week?

2, Did she teach us English last year?

3, Did they do their homework carefully?

4, Did the Robinsons buy a lot of souvenirs?

5, Did tourists eat seafood at that famous restaurant?

6, Did the teacher give her students a lot of homework?

7, Did his uncle take him to see Cham people?

8, Did Liz buy a lot of souvenirs?