when it came time to.中的it指的是什么?这属于什么语法现象?

when it came time to.中的it指的是什么?这属于什么语法现象? But when it came to their house,it was a time of common sens it在这里到底是什么语法成分?指的是什么呢?When it comes to German,I know nothing •it在这里到底是什么语法成分?指的是什么呢?When it comes to German,I know this man decided to go big when it came time to propose to h When it came time for me to marry,my father decided to dole when it come time to it's hard to breathe是什么语法现象? it’s time to go .有什么语法 a lot of people come to see it 中的come to 是在语法上属于什么成分? i find it hard to make ends meet.中的hard做什么词性,句子涉及的语法是什么 Can I read it when you're done 为什么用系动词+动词的完成时呢?这是什么语法现象?