`1`. She is interested in being in front of the screen in her free time.

`-` S + be + interested in + V-ing: hứng thú làm gì

`-` in one's free time: trong thời gian rảnh rỗi của ai

`2`. Was she interested in posting her life on social media?

`-` S + like + V-ing

`=` S + be + interested in + V-ing

`3`. It's not good for your health to eat too much fatty food.

`-` It's + (not) + adj + (for O) + to-V

`4`. How many classrooms are there in your school?

`-` How many + N-số nhiều + are there?

`Answer + Explai n :`

`1.` She is interested in being in front of the screen in her free time.

`->` Interested in `+` V-ing : hứng thú cái gì...

`->` in front of sth : trước cái gì đó

`->` in sb's free time : trong thời gian rảnh rỗi của ai đó...

`2.` Was she interested in posting her life on social media `?`

`->` like `+` V-ing `=`

`=>` Interested in `+` V-ing : hứng thú cái gì...

`3.` It is not good for your health to eat too much fatty food.

`->` It's not good `+` for O `+` to V ai không nên làm gì...

`4.` How many classrooms are there in your school?

`->` How many `+` N số nhiều `+` are there..?