`1.` $(-)$ The students were not at school yesterday afternoon.

      $(?)$ Were the students at school yesterday afternoon?

`2.` $(-)$ Lan was not at the festival last week.

      $(?)$ Was Lan at the festival last week?

`3.` $(-)$ My father was not in Ha Noi Last month.

      $(?)$ Was my father in Ha Noi Last month?

`4.` $(-)$ We didn't take part in the rice- cooking festival.

      $(?)$ Did you take part in the rice- cooking festival?

`5.` $(-)$ Nam and Ba didn't playfootball in the school yard yesterday morning.

      $(?)$ Did Nam and Ba play football in the school yard yesterday morning?

`6.` $(-)$ Tam didn't do his homework last night.

      $(?)$ Did Tam do his homework last night?

`7.` $(-)$ Last night I didn't go to the supermarket with my mother.

      $(?)$ Did you go to the supermarket with your mother last night?

`8.` $(-)$ The students didn't write new words many times this morning.

      $(?)$ Did the students write new words many times this morning?

`9.` $(-)$ Tuan didn't read a new novel last week.

      $(?)$ Did Tuan read a new novel last week?

`10.` $(-)$ We didn't drink a lot of soft drink at the party last night.

        $(?)$ Did you drink a lot of soft drink at the party last night?

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Thì quá khứ đơn:

`-` Với động từ to be:

$(+)$ S + was/ were + N/ adj

$(-)$ S + was/ were + not + N/ adj

$(?)$ Was/ Were + S + N/ adj?

`-` Với động từ thường:

$(+)$ S + ved/V2

$(-)$ S + didn't + Vinf

$(?)$ Did + S + Vinf?