1. go-> went

2. have-> had

3. be-> was/ were

4. eat-> ate

5. learn-> learned/ learnt

6. understand-> understood

------

1. didn't sleep 

2. worked

3. were

4. did you do

5. took

-----

Thì quá khứ đơn:

- Với động từ to be:

(+) I/ He/ She/ It/ Danh từ số ít+ was...

   You/ We/ They/ Danh từ số nhiều+ were...

(-) I/ He/ She/ It/ Danh từ số ít+ was + not...

   You/ We/ They/ Danh từ số nhiều+ were+ not...

(?) Was+ I/ he/ she/ It/ danh từ số ít+ ...?

   Were+ you/ we/ they/ danh từ số nhiều+...?

- Với động từ thường

(+) S+ V2/ Ved...

(-) S+ didn't/ did not+ V...

(?) Did+ S+ V...?

Bài 1

1. go -> went

2. have -> had

3. be -> was/were

4. eat -> ate

5. learn -> learnt, learned

6. understand -> understood

Bài 2

Câu 1

didn't sleep

Câu 2

worked

Câu 3

were

Câu 4

Were/ did

Câu 5

took

Cấu trúc thì QKĐ

Đối vs tobe

Khẳng định: S + was/ were

Phủ định: S + was/were + not

Câu hỏi: Were/ Was + S?

Đối vs động từ thường

Khẳng định: + V-ed

Phủ định: S + did not + V (nguyên thể)

Câu hỏi: Did + S + V(nguyên thể)?