Exercise 3:
$\text{1.}$ had eaten
$\text{→}$ QKHT + by the time + QKD
$\text{2.}$ had taken
$\text{→}$ hd lấy tiền xảy ra trước chia QKHT
$\text{3.}$ got
$\text{4.}$ had left
$\text{5.}$ had finished
$\text{→}$ After + QKHT, QKD
$\text{6.}$ watched
$\text{7.}$ had already seen
$\text{→}$ có already
$\text{8.}$ had ever seen
$\text{→}$ It was the first time + QKHT
$\text{9.}$ hadn't eaten
$\text{→}$ before ⇒ HTHT ⇒ QKHT <vì câu trần thuật>
$\text{10.}$ sat - rested
$\text{11.}$ had gone - went
$\text{12.}$ told - visited
$\text{→}$ yesterday chia QKD
$\text{→}$ in + năm chia QKD
$\text{13.}$ watched - had done
$\text{→}$ Tôi làm bt sau ds mới xem TV
$\text{14.}$ had broken
$\text{→}$ anh ấy làm vỡ lọ sau đó mẹ mới tức giận
$\text{15.}$ hadn't turned
$\text{→}$ để lại kết quả trong QK ⇒ QKHT
