有道题不会，希望高手帮忙

pass by 一般的动词短语,路过
We'll pass by that street.
passing by 可以用在进行时中,也可以作后置定语.
A car is passing by.
There are a lot of people passing by.有很多过路的行人.

pass by 是动词短语，可谓语
passing by 也是动词短语，可时态为ING后就只可作为状语，补语而不能作谓语了