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一道英语选择,it was helpful___him to solve the case答案是for,为啥不是of,他

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一道英语选择,
it was helpful___him to solve the case答案是for,为啥不是of,他很乐于助人啊
形式主语在英语中通常是it is adj for/of sb to do sth,但是for/of略有区别,如果是for,那么这个it is 后面的形容词修饰的是不定式,比如说it is important for us to protect the environment,保护环境很重要,而不是我们很重要,这很明显important是修饰to protect the environment.如果说用of ,那么那个形容词修饰的是sb,比如说it is nice of you to help him.是你很好,而不是帮助人很好.你那题如果严格来说要用for,因为是他解决了问题很有帮助,而不是他很有帮助.
其实这题出的不怎么好,因为如果你说这个形容词是形容him的其实也说得过去,但是最好还是用for.
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一道英语选择,it was helpful___him to solve the case答案是for,为啥不是of,他 英语解释句子1.It's (a piece of cake) for me to solve the problem.解 一道英语选择it is necessary for us to do  —for the wildl It is easy __ the problem.A,for him solve B,for him to solve 一道英语选择题：Try to solve the problems one ______ 一道英语选择提---It's so kind of you to give me a ride to the stati Scott found____difficult to solve the problem.填it还是it was还是都 it was a picture （）horses in the field.答案为什么是of 不是with?这句话怎么 The problem was too diffcuclt for __ to solve.We had to ask it was foolish of her to belive the guy 中的was为什么不是is 求答案阿英语完成句子：1.It was ＿（直到周六）he began to prepare for the exam. 1.It is easy ( ) the problem.A.for him solve B.for him to so