$\text{1.}$ has just finished

$\text{→}$ just chia HTHT

$\text{2.}$ hasn't done

$\text{→}$ yet chia HTHT

$\text{3.}$ have you studied - Did you study

$\text{→}$ Câu trả lời có for nên câu hỏi chia HTHT

$\text{4.}$ have never eaten

$\text{→}$ before, never chia HTHT

$\text{5.}$ have helped

$\text{→}$ This is the first time chia HTHT

$\text{6.}$ saw - have seen

$\text{→}$ last week chia QKD, so far chia HTHT

$\text{7.}$ didn't go - went

$\text{8.}$ was - played

$\text{9.}$ built - have just redecorated

$\text{→}$ ago chia QKD

$\text{→}$ just chia HTHT

$\text{10.}$ have known

$\text{→}$ for chia HTHT

$\text{11.}$ didn't see - told

$\text{12.}$ bought - did you pay - paid

$\text{13.}$ did you find - found - didn't you leave