`-` Hiện tại hoàn thành :

`(+)` S + have / has + V-ed/c3 +....

`(-)` S + haven't / hasn't + V-ed/c3 +...

`(?)` ( Wh-questions ) Have / Has + V-ed/c3 +...?

`-` Dấu hiệu nhận biết : for , since , just , already , yet , ever , never , it's the first time .

`-` Dùng để nói về :

`@` Những tình huống bắt đầu chính xác trong quá khứ .

`@` Các hành động đã hoàn thành tại một thời điểm trong quá khứ không được đề cập .

`@` Các hành động đã hoàn thành trong đó điều quan trọng là lý do bây giờ .

`1.` The lesson hasn't started yet .

`2.` The teacher has already written on the board .

`3.` Joe and Tim have just come into the classroom .

`4.` Tony hasn't finished getting his books ready .

`5.` Christine has already opened her book .

`6.` Dave has dropped his pen on the floor .

`7.` He hasn't picked it up yet .

* Cấu trúc thì HTHT 

(+) S + have/has + V-pp 

(-) S + haven't/hasn't + V-pp

(?) Have/Has + S + V-pp+...?

- DHNB: yet, already,..

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`1.` The lesson hasn't started yet

`2.` The teacher has already written on the board.

`3.` Joe and Tim have just come into the classroom

`4.` Tony hasn't finished getting his books ready

`5.` Christine has already opened her book

`6.`  Dave has dropped his pen on the floor

`7.` He hasn't picked it up yet