英语语法：it作先行词的用法(2)
it的用法
4）作先行词，引导非谓语动词或者从句。例如：
He took it for granted to ask for a reward for his service.
他把提供服务收取酬劳视为当然。
结构分析：He是主语，took是谓语，过去一般时，it是宾语，for granted宾语补语，to ask for a reward for his service是不定式词组，作真正的宾语，指前面it指代的内容。
It is a pity that you missed that singer on TV last night.
可惜，你错过了昨晚电视里那个歌星的演唱。
结构分析：It是形式主语，is是be动词，a pity是名词词组作表语，that you missed that singer on TV last night是真正的主语，其中you是主语，missed是谓语，过去一般时，that singer是宾语，on TV是地点状语，last night是时间状语。
5）某些结构习惯用it作为主语。例如：
It appeared that his interview was success.
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