主从复合句对主句的一般疑问

名词性从句里面,有主语从句,宾语从句以及表语从句,这些陈述句应该有一般问句形式,下列表述正确与否,如果不正确,应该如何表达
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【一】宾语从句【1】They knew that he is a child.?变为一般问句:Did they know that he is a child?【正确】【2】He asked whether you need help.?变为一般问句:Did he ask whether you need help?【正确】【3】They've known why he hadn't come here.??变为一般问句:Have they known why he hadn't come here?【正确】备注:宾语为从句的时候,只需要主句一般疑问句,宾语从句表示不变。【二】表语从句【1】The fact is that he is a child.?变为一般问句:Is the fact that he is a child?【正确】【2】The question is whether you saw me.?变为一般问句:Is the question whether you saw me?【正确】【3】The problem is how we will go there.?变为一般问句:Is the problem how we will go there?【正确】备注:表语为从句的时候,把主句be动词提前到句首变一般疑问句。【三】主语从句【1】That he is careful is a fact.?变为一般问句:Is that he is careful a fact?【错误】更正:Is it a fact that he is careful?【2】Whether they will come is a question.?变为一般问句:Is whether they will come a question?【错误】更正:Is it a question whether they will come a question?【3】How we go there is a problem.?变为一般问句:Is how we go there a problem?【错误】更正:Is it a problem how we go there a problem.备注:that引导陈述分句作主语和wh-疑问词引导疑问分句作句中主语,变一般疑问句的时候需要使用外置主语结构,即使用形式主语it?,把真正主语放在句末。Warm prompt: ?The above answer,based upon my personal understanding, is only for reference.?
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