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

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

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

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

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

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

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

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

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

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

$\text{⇒ yesterday }$

$\text{⇒ ago }$

$\text{⇒ last ( week ,.....)}$

$\text{⇒ in + time ( in the past) }$

$\text{⇒ the day before }$

$\text{⇒ today}$

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

$\text{⇒ Khi ta có chủ ngữ là vật và có dấu hiệu thì QKĐ}$

$\text{⇒ Dùng câu bị động của thì QKĐ sẽ có dạng sau:}$

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

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

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

$\text{5 was regarded}$

$\text{6 was developed}$ 

$\text{7 was built}$ 

$\text{8 were reconstructed}$ 

$\text{9 was based}$ 

$\text{10 were recognised}$ 

$\text{Học tốt!!!}$