What do your father and mother do?中为什么要填do
问题描述：
What do your father and mother do?中为什么要填do
答
your father and mother 是复数所以是dothere are many cars on the street.It is very dangerous to cross the street.中为什么要填dangerous是不是根据句意It is 形容词+to do sth 固定搭配