$\text{1. took (Last week ⇒ Thì QKĐ ⇒ take → took)}$
$\text{2. arrived ............ weren't (Cấu trúc When + QKĐ, QKĐ)}$
$\text{3. said .......... bought (Câu gián tiếp)}$
$\text{4. taught (Last summer ⇒ Thì QKĐ)}$
$\text{5. started ........... was (QKĐ + when + QKĐ)}$
$\text{6. donated (Thì QKĐ ⇒ donate → donated)}$
$\text{7. rang ......... invited (yesterday ⇒ Thì QKĐ dùng cho cả 2 vế của câu)}$
$\text{8. did .... watch (last night ⇒ Thì QKĐ)}$
$\text{9. was ......... used to (When + QKĐ, QKĐ)}$
$\text{10. Did you go (yesterday ⇒ Thì QKĐ)}$
$\text{11. wasn't .......... didn't feel (Thì QKĐ)}$
$\text{12. spent (Thì QKĐ⇒ spend → spent)}$
$\text{13. wrote ........ didn't write (Thì QKĐ ⇒ write → wrote)}$
$\text{14. Were they (Thì QKĐ chủ ngữ they ⇒ were)}$
$\text{15. saw (Yesterday ⇒ Thì QKĐ)}$
$\text{Cấu trúc thì QKĐ}$
$\text{(+) S + V(ed/c2) + ....................}$
$\text{(-) S + didn't + V(nguyên thể) + ............}$
$\text{(?) Did + S + V(nguyên thể).......?}$