It's +过去分词表示什么意思 两种情况1、It's 是 It has 的缩写，比如It's gone.它已经走了.It's reported that.XXX已经被报道过了.2、It's 做形式主语，表示客观事实.比如It's hoped大家希望都It'sreported据报道It's believed 大家都相信It's said 大家都说It's known 众所周知
“it +be +过去分词+从句” 结构 你说的“it+be+过去分词+从句”是主语从句.原先，是由宾语从句变来的：They say that he enjoys classic music(宾语从句)-（主语从句）：It is said that he enjoys classic music.分析：It（形式主语）i.
have+动词过去式是什么语法？例如I have knew it.是不是错误的？注意我说的是过去式不是过去分词. 错误的，have/has+done（过去分词）是现在完成时.没有have/has+过去式的用法i knew it.i have known it.
