除if外,所有引导宾语从句的关联词都能用来引导主语从句 Who will go is still unknown.谁去还不知道 What we need is more time,我们需要的是更多的时间 主语从句放在句首,句子显得头重脚轻,故通常把它移到句子后面,前面用引导词it来做它的形式主语 It's not yet known where she has gone.还不知道她到哪去了 It's a pity that she has made such a mistake.很遗憾,她犯了这样一个错误 祝你进步,望采纳
