=>>
2. The students are not wearing school uniforms.
3. He is chatting to his best friend.
4. She is not running for the school bus.
5. We are having a break from the lesson.
6. I am not learning a musical instrument.
Thì HTTD :
(+) S is/am/are Ving
(-) S is/am/are not Ving
(?) Is/Am/Are S Ving?

2. The students aren't wearing school uniform.

3. He is chatting to his best friend.

4. She isn't running for the school bus.

5. We are having a break from the lesson.

6. I'm not learning a musical instrument.

Thì hiện tại tiếp diễn: 

(+) S + is/am/are + V_ing

(-) S + is/am/are + not + V_ing