It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词连接吗

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It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词连接吗
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It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词连接吗
It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词连接吗

It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词连接吗
这里的句型 是:
It is +形容词+ for sb +to do sth 对某人来说做某事是怎样的
it 作形式主语、真正的主语是后面的动词不定式to do
for sb 是对某人来说、

这是一个句型结构:it is \ was +adj for \ of sb to do sth.
谓语是is, for不能理解为连接啊,不然就是连词了

谓语是is 这句话换个说法更容易理解 doing it is difficult for him

谓语是is ,而is是系动词,形容词difficult只是作is的表语,for不是介词连接