$\text{1.}$ gave 

$\text{2.}$ Were 
$\text{3.}$ swam 

$\text{4.}$ forgot 

$\text{5.}$ saw 

$\Rightarrow$ Câu 1 - last birthday 

$\Rightarrow$ Câu 2 - three days ago 

$\Rightarrow$ Câu 3 - yesterday afternoon 

$\Rightarrow$ Câu 4 - QKD + when + QKD 

$\Rightarrow$ Câu 5 - last Sunday

$\Longrightarrow$ S + Ved/cột 2 + O 

$\Longrightarrow$ S + didn't + V-inf + O 

$\Longrightarrow$ Did + S + V-inf + O ? 

$\textit{@Ran}$

=>
1. gave
2. Were you
3. swam
4. forgot
5. saw
Thì QKĐ
Đối với tobe :
(+) S was/were...
(-) S was/were not...
(?) Was/Were S...?
Đối với động từ thường :
(+) S V2/ed
(-) S didn't V
(?) Did S V?