1. I visited my grandparents last weekend.

- Thì QKĐ : S + Ved/Vpp

- Dấu hiệu : last weekend

2. In the morning, we went on a picnic.

- Thì QKĐ : S + Ved/Vpp

3. Did she watch cartoons on TV last night?

- Thì QKĐ dạng nghi vấn : Did + S + V-bare ?

- Dấu hiệu : last night

4. What did you do at the funfair?

- Thì QKĐ dạng nghi vấn :  Wh-question + did + S + V-bare ?

Answer + explanation : 

1. I visited my grandparents last weekend .        ( Thì QKĐ : S + Ved/Vpp .... .  )

2. In the morning, we went on a picnic.               ( Thì QKĐ : S + Ved/Vpp ..... .  )

3. Did she watch cartoons on TV last night?       ( Thì QKĐ : Did+S + V-bare ? ) 

4. What did you do at the funfair?            ( Thì QKĐ :  What +did+S+V-bare ? ) 

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