题目内容：

It's so nice to hear your voice.
和 It's necessary for you to lock the car when you do not use it.的主语、谓语是哪些?

优质解答

这两个句子都是"主系表"句型.都是用it 作形式主语,不定式作真正的主语.It's necessary for you to lock the car when you do not use it.中it 作形式主语,is 作连系动词,necessary作表语,for you to lock the car 作...