$\text{→ Thì quá khứ đơn sẽ có dạng như sau : }$

$\text{⇒ Công thức thì QKĐ với động từ thường :}$

$\text{( + ) S + V_ed \ 2 + O + time}$

$\text{( - ) S + didn't + V_inf + O + time}$

$\text{( ? ) Did + S + V_inf + O + time ?}$

$\text{⇒ Công thức thì QKĐ với động từ tobe: }$

$\text{( + ) S + was \ were + O + time }$

$\text{( - ) S + was \ were + not + O + time}$

$\text{( ? ) Was \were + S + O + time ? }$

$\text{→ Dấu hiệu nhận biết thì QKĐ sẽ gồm có như sau: }$

$\text{⇒ yesterday }$

$\text{⇒ ago }$

$\text{⇒ last ( week ,.....)}$

$\text{⇒ in + time ( in the past) }$

$\text{⇒ the day before }$

$\text{⇒ today}$

$\text{⇒ this afternoon, this morning }$

1. was
2. died
3. moved
4. found
5. were
6. decided
7. began
8. wrote
9. needed
10. tried
11. were 

12. opened

$\text{Khoa}$