$\text{7.}$ has written - hasn't finished

$\text{→}$ for + khoảng tg và yet chia HTHT

$\text{8.}$ does she play - plays

$\text{→}$ How often và sometimes chia HTD

$\text{9.}$ were you doing - phoned - was watering

$\text{→}$ When chỉ sự việc đang xảy ra thì sự việc khác xen vào

$\text{10.}$ Have you ever seen

$\text{→}$ ever chia HTHT

$\text{11.}$ was sitting - met

$\text{12.}$ was going

$\text{→}$ At this time yesterday là tg xác định ở QK chia QKTD

$\text{13.}$ was repairing - began

$\text{14.}$ were having

$\text{→}$ at this time last Monday chia QKTD

$\text{15.}$ will be having

$\text{→}$ at this time next summer chia TLTD

$\text{16.}$ Have you met - met

$\text{→}$ recently chia HTHT

$\text{→}$ yesterday chia QKD

$\text{17.}$ has she lived - has lived - left

$\text{→}$ How long + HTHT

$\text{→}$ HTHT + since + QKD

$\text{18.}$ were they doing - were doing

$\text{→}$ 2 p.m yesterday chia QKTD

$\text{19.}$ has prepared

$\text{20.}$ visited - was doing