are you sure ()they will come为什么天 that ×而不是if ×或whether or not

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are you sure ()they will come为什么天 that ×而不是if ×或whether or not
are you sure ()they will come
为什么天 that ×
而不是if ×
或whether or not

are you sure ()they will come为什么天 that ×而不是if ×或whether or not
这其实是一个主系表结构.you是主语.are是系动词.sure形容词作为表语.姑且把that they will come是修饰sure的从句.因为没有表语从句的说法.所以语法上一般归为宾语从句.或者也可以理解为sure是修饰that they will come这句（可以看成名词）的形容词.

你确定他们会来吗？

are you sure (that)they will come
因为前面是sure，表示的是确定的意思，所以连词只能用肯定句的连词that如果是doubt之类的词就填whether或者if
有不会的可以再问我还是不懂whether和if的话解释为是否，套进去句子就变成你确定他们是否回来，确定和是否前后矛盾，所以不能用...

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are you sure (that)they will come
因为前面是sure，表示的是确定的意思，所以连词只能用肯定句的连词that如果是doubt之类的词就填whether或者if
有不会的可以再问我

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are you sure (that)they will come
因为前面是sure，表示的是确定的意思，所以连词只能用肯定句的连词that如果是doubt之类的词就填whether或者if

这是一个that引导的宾语从句如果这句话表达有是否回来的意思 if没有是否的意思不能选就像你说的如果选whether 后面没有or not 也不能用

宾语从句

后面的句子做宾语

are you sure they are 英语翻译Are you sure? Are you sure? sure .here you are. ARE YOU SURE{?}THAT? are you sure 英语翻译Are you sure? are you sure? really?are you sure? they are sure to be A:Hi,Joe.What are they?B:They are photos.A:__________?B:Sure.Here you are!该如何填空? Are you sure your mother will come?they asked(转换为间接引语） are you sure ()they will come为什么天 that ×而不是if ×或whether or not do you know jackie chan,paul jackson and jet li - sure.they are my favorite [ ]. sure.Here you are这句呢 Are you sure of that Sure.Here you are.怎吗念 are you sure 什么意思