`1`.It is dangerous to ride your bike fast

`\rightarrow` It is ( not ) + adj + to do sth : Như thế nào để làm gì

`2`.It is funny to watch the circus on television

`\rightarrow` It is ( not ) + adj + to do sth : Như thế nào để làm gì

`3`.Thu is happy because she wins the competition again

`\rightarrow` Because dùng để chỉ nguyên nhân hoặc lý do

`4`.She was so unhappy because she heard a sad news from her friend

`\rightarrow` Because dùng để chỉ nguyên nhân hoặc lý do

`5`.Phong is anxious because he is moving to a new school

`\rightarrow` Because dùng để chỉ nguyên nhân hoặc lý do

`\text{@ TheFox}`

1) It is very dangerous  for you to ride your bike ( too) fast.

2) It is ( very) funny to watch the circus on television

3) Thu is happy because she wins the competition again.

Thu is happy because of her winning competition

4) She was so unhappy because she heard a sad news from her friend.

5) Phong is anxious because he's moving to a new school.