2 Phủ định: She didn't buy a new drees yesterday.

   Nghi vấn: Did she buy a new dress yesterday?

3 Phủ định: They weren't late for school.

   Nghi vấn: Were they late for school?

4 Phủ định: Mr Tam didn't take his children to the museum last Sunday.

   Nghi vấn: Did Mr tam take his children to the museum last Sunday?

5 Phủ định: Hoa didn't make a cushion for her armchair.

   Nghi vấn: Did Hoa make a cushion for her armchair?

Công thức QK đơn:

Khẳng định: - S + was/ were +…

                     - S + V(ed) +O .

Phủ định: - S + wasn't/ weren't +…

                 - S + didn't + V(nguyên thể) + O.

Nghi vấn: - Was/Were + S +...

                 - Did + S + O?

Chúc bạn học tốt! nếu có thể thì cho mình xin câu trả lời hay nhất nha!

2. (-) She didn't buy a new dress yesterday.

    (?) Did she buy a new dress yesterday?

3. (-) They weren't late for school.

    (?) Were they late for school? 

4. (-) Mr. Tam didn't take his children to the museum last Sunday.

    (?) Did Mr. Tam take his children to the museum last Sunday?

5. -) Hoa didn't make a cushion for her armchair.

    (?) Did Hoa make a cushion for her armchair?

-------------

Thì Quá khứ đơn:

- Với động từ:

(-) Câu phủ định: S + didn't + V-inf.

(?) Câu nghi vấn: Did + S + V-inf?

- Với tobe:

(-) Câu phủ định: S + was/ were + not + V-inf.

(?) Câu nghi vấn: Was/ Were + S + adj/ (a/an) + N?