英语高手进,看到一句英语句子,

题目

英语高手进,看到一句英语句子,
Many city residents complain that it is so few buses in their ciy that they have to spend much more time waiting for a bus.
为什么是用it is?
如果用there are?
能说的清楚些吗？什么从句？it什么成分？

答案

Many city residents complain that（到此是一个that引导的宾语从句,后面的所有成份即it is so…a bus.部分做complain的宾语,而这部分又是一句完整的话,所以要用it代替整句话）it is so few buses in their ciy that （此部分有一个so…that的用法）they have to spend much more time waiting for a bus.
全句的意思为：很多城市居民抱怨说,他们生活的城市公车太少,以致于每天要花比以往更多的时间来等车.