Chia dong tu o thi Qua Khu Don : 

Tobe : S + was/were + Ved/cot 2 

DT thuong : S + Ved/cot 2 

                    S + didn't + V(bare ) 

                     Did + S + V(bare ) ? 

                     -> Yes .S+did 

                     -> No , S + didn't 

1.I ate dinner at six o'clock yesterday . 

2.Did Helen drive to work ? 

yes , she did 

3.My neighbor bought a new car last week .

4.They went to italy on their last summer holiday .

5.DId they swim at the beach ?

No , they didn't .

6.My family and I saw a comedy movie last night .

7.First , we did exercise , and then we drank some water .

8.Suddenly , the animal jumped and bited my hand .

9.What time did you get up this morning?

10. The Wright brothers flought the first airplane in 1903.

Chia động từ ở thì quá khứ đơn :

1. ate 

2. did / did

3. bought 

4. went 

5. did

6. saw 

7. did / drank 

8. bited 

9. did / up

10. flought

Công thức : 

Tobe : S + was / were + Ved / cot 2

ĐT thường : S + Ved / cot 2

                  S + didn't + V ( bare ) 

                    Did + S + V ( bare )