$\text{YOONMIN FOREVER}$
+ Chidren were tired because they ...had played... for two hours.
+ Sally ...had never been stopping... studying all day. She didn’t even have one break.
+ She ...had analysed... the document for hours. That’s why she needed a rest.
Bonus: Cấu trúc thì QKHT, QKHTTD:
- Quá khứ hoàn thành: S + had + P2 + ...
- Quá khứ hoàn thành tiếp diễn: S + had + P2 + ...
$\text{#BTS}$