ta có cấu truc thì HTTD 

-> s + be + v-ing

1 We are working on the new show right now. => câu HTTD 

-> we aren't working on the new show right now 

-> We are working on the new show right now. 

-> Are we working on the new show right now? 

2 I’m not talking on the phone at the moment. -> thì HTTD 

-> I’m  talking on the phone at the moment.

-> Am I talking on the phone at this moment?

3 Is he running very fast? 

-> he is running fast 

-> he isn't running fast ?

4 Julia is baking a chocolate cake at the moment.

-> Julia isn't baking a chocolate cake at the moment.

-> is Julia  baking a chocolate cake at the moment.?

5 Are Tony and Kaity helping the teacher right now?

-> Tony and Kaity are helping the teacher right now

-> Tony and Kaity aren't helping the teacher right now

`1.` 

`(-)` We aren't working on the new show right now.

`(?)` Are we working on the new show right now.

`2.`

`(+)` I'm talking on the phone at the moment.

`(?)` Are you talking on the phone at the moment?

`3.`

`(+)` 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?

`5.`

`(+)` Tony and kaity are helping the teacher right now.

`(-)` Tony and kaity are helping the teacher right now.

`->`

Thì hiện tại tiếp diễn 

`(+)` `S` `+` $is/ are / am$ `+` `Ving` `+` `O` 

`(-)` `S` `+` $isn't / aren't / amnot$ `+` `Ving` `+` `O`

`(?)` $Is / Are / Am$ `+` `S` `+` `Ving` `+` `O` `?`