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`2.` `(-)` They don't go to school.

        `(?)` Do they go to school?

`3.` `(-)` She isn't drawing a picture.

        `(?)` Is she drawing a picture?

`4.` `(-)` We don't meet some friends everyday.

       `(?)` Do we meet some friends everyday?

`5.` `(-)` I am not writing a letter at present.

        `(?)` Am I writing a letter at present?

`6.` `(-)` She doesn't watch TV every morning.

        `(?)` Does she watch TV every morning?

`7.` `(-)` He doesn't go swimming every Sunday.

        `(?)` Does he go swimming every Sunday?

`8.` `(-)` My father isn't watching TV.

        `(?)` Is my father watching TV?

`9.` `(-)` My mother doesn't make a cake.

        `(?)` Does my mother make a cake?

`10.` `(-)` They don't buy a book.

          `(?)` Do they buy a book?  

`@` HTTD:    

`(+)` I `+` am`+` Ving

You/they/we `+` are `+` Ving

She/he/it/N `+` is `+` Ving

`(-)` I `+` am`+` not `+` Ving

You/they/we `+` are `+` not `+` Ving

She/he/it/N `+` is `+` not `+` Ving

`(?)` Am `+` I `+` Ving`?`

Are `+` They/you/we/Ns `+` Ving`?`

Is `+` she/he/it/N `+` Ving`?`

`DHNB:` At the moment`,` at present`,` now, Look!, Keep silent!`,...`

`+` Hành động đang xảy ra

`+` Thu hút sự chú ý `->` Hành động đang xảy ra

`+` Dự định, kế hoạch trong tương lai (Khả năng xảy ra cao) 

`@` HTĐ:

`-` V tobe:

`(+)` I `+` am`+` O

       You/they/we `+` are `+` O

       She/he/it/N `+` is `+` O

`(-)` I `+` am`+` not `+` O

       You/they/we `+` are `+` not `+` O

       She/he/it/N `+` is `+` not `+` O

`(?)` Am `+` I `+` O`?`

       Are `+` They/you/we/Ns `+` O`?`

       Is `+` she/he/it/N `+` O`?`

`-` V thường

`(+)` She/he/it/N `+` $V_{s/es}$

        I/we/they/you `+` V

`(-)` She/he/it/N `+` does `+` not `+` V

       I/we/they/you/Ns `+` do `+` not `+` V

`(?)` (Wh_question) `+` Does `+` She/he/it/N `+` V`?`

       (Wh_question) `+` Do `+` I/we/they/you/Ns `+` V`?`
`DHNB:` Always, usually, often, once/twice/three times a day/month/week`,...`

`+` Diễn tả thói quen, lặp lại

`+` Diễn tả sự thật 

`+` Diễn tả một kế hoạch, lịch trình