`6` It is not easy to speak english fluently

`->` Cấu trúc : It is + not + adj + to V-inf

`7` How many rooms does Hoa's housse have ?

Cấu trúc : How many + danh từ số nhiều + are there + …?

`=` Cấu trúc : How many + do/does + S + V-inf ?

`8` He goes to work by bicycle everyday 

`->` cycle to work = go to work

`6.` It is not easy to speak English.

`->` It is (not) + adj + to V(inf) 

`7.` How many rooms does Hoa's house have?

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

`=`

How many + do/does + S + V(inf) ?

`8.` He goes to work by bicycle everyday.

`->` cycle (v) : đạp xe 

Bicycle (n) : xe đạp 

`=>` Dùng "bike" (Động từ "cycle" đi với danh từ "bicycle")