i think it is necessary that. and that.这样用有错吗,第二个that是不是要去掉?

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ithinkitisnecessarythat.andthat.这样用有错吗,第二个that是不是要去掉?ithinkitisnecessarythat.andthat.这样用有错吗,第二个that是

i think it is necessary that. and that.这样用有错吗,第二个that是不是要去掉?
i think it is necessary that. and that.
这样用有错吗,第二个that是不是要去掉?

i think it is necessary that. and that.这样用有错吗,第二个that是不是要去掉?
可以是：　i think it is necessary that +　主语　+　谓语 and that +　主语　+　谓语　（这里两个that 从句都是主语从句（后移的主语从句）.如 I think it is necessary that we do this quickly and that we go to sleep earlier.
也可以是：i think it is necessary that we do this quickly and go to sleep earlier.(这里只有一个that 引导的主语从句,do 与 go 为并列的谓语动词.
当作者要说的句子不长,第2个就显得垒赘.但是当作者要说的句子太长,第2个that 就显得必要,因为不然的话,读者就会比较难看清作者的句子了.

I it think is right it作形式宾语——find/think/belive+形容词/名词/for sb.+to do sth.例句：we all think it necessary to do exercise.关于这个句式,为什么不是it+is+形容词/名词即：we all think it's necessary to do exercise.此时 it's necess it is not what i think you think but what you think i think you think. I think it is very interesting 是什么意思 i think it is about dreams. I don’t think it is { } coat I think it is my worry too I think it is __________ interesting movie i think it is improssble是什么意思 but I think it is very i think it interesting为什么没有is? i think it is improssble是什么意思 I think,friendship is a________.It can___________. it is too bad.I think (),too. I think it is bad for us It is very cloudy.I think it _________（rain）. I think it impossible 还是 it is mpossible I think it is not anything is possible是什么意思?