Đáp án + Giải thích các bước :

1.

( + ) : He is running very fast

( - ) : He is not running very fast

( ? ) : Is he running very fast ?

_______________________

4.

( + ) : Julia is baking a chocolate cake at the moment

( - ) : Julia is not baking a chocolate cake at the moment

( ? ) : Is Julia baking a chocolate cake at the moment ?

____________________

Thì hiện tại tiếp diễn :

- Cấu trúc :

( + ) : S + to be + V-ing

( - ) : S + to be + not + V-ing

( ? ) : To be + S + V-ing

+ I dùng am

+ He , she , it , danh từ số ít dùng is

+ You ,we , they , danh từ số nhiều dùng are

`1`

`(+)` He is running very fast.

`(-)` He isn't running very fast.

`4`

`(-)` Julia isn't baking a chocolate cake at the moment.

`(?)` Is Julia baking a chocolate cake at the moment?

`----------`

`***` Hiện tại tiếp diễn

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

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

`(?)` (Wh) + Am/Is/Are + S + Ving?