`**` Bài làm:

`1.` are going 

`2.` are having 

`3.` is reading 

`4.` are doing 

`5.` are brushing

`6.` are travelling

`7.` is not doing `/` is sleeping

`8`. are not working `/` are doing

`9.` is not doing `/` is watching 

`10.` Is Nga reading 

`11.` Are they playing 

`12.` Are the children washing 

`13.` Is your mother travelling 

`14.` is Mr Hung reading `/` is listening 

`15.` Is she travelling 

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`**` Công thức:

`-` `(+)`: S `+` am`/`is`/`are `+` V`-`ing

`-` `(-)`: S `+` am`/`is`/`are `+` not `+` V`-`ing

`-` `(?)`: Am`/`Is`/`Are `+` S `+` V`-`ing `?`

`@` Dấu hiệu: now, at the moment, at present, Look!, Listen! `->` Dùng hiện tại tiếp diễn