It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词吗
题目
It is diffcult for him to do it 谓语是is diffcult吗 那for只是介词吗
答案
It is diffcult for him to do it.
此句完全正确,你说得也非常对!谓语是is diffcult,是系表结构做谓语;for是介词;
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