` 1`. studies

` 2`. was playing

` 3`. have lived

` 4`. didn't seen

` 5`. watched

` 6`. has already left

` 7`. worked

` 8`. was cooking

` 9`. will begin

` ---------`

` @` Hiện tại hoàn thành

` (+)` S + have/has + V-ed/V3 + ...

` (-)` S + have/has + not + V-ed/V3 + ...

` (?)` Have/has + S + V-inf + ...?

` -` DHNB : just, recently, lately, already, not…yet, never, ever, since, for, so far…

` --------`

` @` Quá khứ đơn 

` (+)` S + V-ed/V2 + ...

` (-)` S + didn't + V-inf + ...

` (?)` Did + S + V-inf + ...?

` -` DHNB : ago, last, in + năm trong qk, in the past, ....

` ---------` 

` @` Hiện tại đơn

` (+)` S + V-inf/es/s + ...

` (-)` S + do/does + not + V-inf + ..

` (?)` Do/does + S + V-inf + ...?

` -` Với V tobe:

` (+)` S + is/am/are + ...

` (-)` S + is/am/are + not + ...

` (?)` Is/am/are + S + ...?

` -` DHNB : often, usually, frequently, seldom, rarely, constantly, always, sometimes, occasionally, everyday/ night/ week…

` --------`

` @` Quá khứ tiếp diễn

` (+)` S + was/were + V-ing + ...

` (-)` S + was/were + not + V-ing + ...

` (?)` Was/were + S + V-ing + ...?

` -` DHNB : at + giờ cụ thể trong qk, at that time, ...