$\text{Công thức thì QKHT}$
$\text{(+) S+had+VPII+...}$
$\text{(-) S+hadn't+VPII+...}$
$\text{(?) ....had+S+VPII+...?}$
$\text{Công thức thì QKTD}$
$\text{(+) S+was/were+V_ing+...}$
$\text{(-) S+was/were+not+V_ing+...}$
$\text{(?) ....was/were+S+V_ing+...?}$
$\text{CHÚC BẠN HỌC TỐT!!}$