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二、介词填空。2空,5分/空,合计10分。36. It's dangerous ____ you to swim alone in the river.It's friendly ____ you to show me the way to the police station.

二、介词填空。2空,5分/空,合计10分。 36. It's dangerous ____ you to swim alone in the river. It's friendly ____ you to show me the way to the police station.

题目解答

答案

我们来逐句分析这两道介词填空题,找出最合适的介词。

第1句:It's dangerous ____ you to swim alone in the river.

我们先分析句子结构:

  • “It's dangerous...” 是一个常见的句型,其中 “it” 是形式主语,真正的主语是后面的不定式 “to swim alone in the river”。

  • 这句话的意思是:“对你来说,独自在河里游泳是危险的。”

  • 在英语中,表达“对某人来说做某事是……”的结构是:

    It's + 形容词 + for + 人称代词 + to do something

    例如:

    • It's important for you to study hard.(对你来说努力学习很重要。)

    当形容词描述的是事情本身的性质(如 dangerous, important, difficult, easy 等)时,用介词 for。

    所以这里,“dangerous” 是描述“游泳”这件事的危险性,强调的是行为本身的性质,因此应该用 for。

✅ 正确答案:for

第2句:It's friendly ____ you to show me the way to the police station.

同样分析结构:

  • “It's friendly...” 也是“It is + 形容词 + ... + to do...” 的结构。

  • “friendly” 是一个描述人的品质或态度的形容词,意思是“友好的”。

  • 当形容词描述的是“某人”的性格或行为是否友好、善良、慷慨等(即评价这个人)时,我们使用介词 of。

    常见结构是:

    It's kind/nice/thoughtful/friendly of someone to do something
    (某人做某事真是太……了,用来赞扬这个人)

    例如:

    • It's kind of you to help me.(你帮我真是太好了。)
    • It's nice of him to invite us.(他邀请我们真是太好了。)

    所以,这里的“friendly”是在赞扬“you”这个人有礼貌、乐于助人,因此应该用 of。

✅ 正确答案:of

最终答案:

  • It's dangerous for you to swim alone in the river.
  • It's friendly of you to show me the way to the police station.

答案填写:

  1. for;of

\boxed{for} \quad \boxed{of}

解析

本题考查介词for和of在句型"It's + 形容词 + ... to do..."中的用法区别。关键点在于:

  1. 当形容词描述事物本身的性质(如dangerous, important等)时,用for;
  2. 当形容词描述人的品质或行为(如kind, friendly等)时,用of。

第一空:It's dangerous ____ you to swim alone in the river.

  1. 句型结构:It's + 形容词(dangerous)+ ... + to do...
  2. 形容词性质:dangerous描述的是“游泳”这一行为本身的危险性,属于事物性质。
  3. 介词选择:根据规则,用for连接人(you),表示“对某人来说做某事是...”。

第二空:It's friendly ____ you to show me the way to the police station.

  1. 句型结构:It's + 形容词(friendly)+ ... + to do...
  2. 形容词性质:friendly描述的是“你”乐于助人的品质,属于人的行为特征。
  3. 介词选择:根据规则,用of连接人(you),表示“某人做某事是友好的”。

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