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“不定式表目的” (Infinitive of Purpose)

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  • 为了说清楚「做这件事是为了什么」,英文用 to + 动词原形(不定式),对应中文的「为了…」,但不需要 because。
  • 结构很简单,用来回答 Why? 这个问题,比如 I use it to go to work(我用它上班)。
  • 常见错误是把 to 和 for 搞混——for 后面接名词(for the lesson),to 后面接动词原形(to learn),两者不能混用。
  • 口语里非常高频,解释「为什么存钱」「为什么搭出租车」这类日常场景几乎都会用到。

重点内容


基本结构:to + 动词原形

用来回答「为什么?」(why?)这个问题。

Why do you have a bicycle? I use it to go to work. 我用它上班。(目的:去上班)

Why does she run every morning? She runs to keep fit. 她跑步是为了保持健康。


常见例句模式

  • He went to the shops to buy some shoes.
    他去商店买鞋子。
  • I'm writing to ask for your help.
    我写信是为了请求你的帮助。
  • My father runs every day to keep healthy.
    我爸每天跑步是为了保持健康。
  • We eat at home to save money.
    我们在家吃饭是为了省钱。

💡 这个结构非常口语化,日常对话里用得很多。

例句练习

  1. She went to the library to study for her exam.
    她去图书馆备考。
  1. I downloaded this app to improve my English.
    我下载这个 app 是为了提升我的英文。
  1. He's saving money to buy a new laptop.
    他在存钱买一台新笔电。
  1. We took a taxi to get there faster.
    我们坐出租车是为了更快到达。
  1. My parents moved to KL to find better jobs.
    我父母搬到吉隆坡是为了找更好的工作。

常见错误

❌ I went to the supermarket for buy some groceries. ✅ I went to the supermarket to buy some groceries. (for 后面接名词,to 后面接动词原形)

❌ She studies hard for to pass the exam. ✅ She studies hard to pass the exam.

❌ I use this app for improving my English. ✅ I use this app to improve my English. (表目的时用 to-infinitive,不用 for + -ing)

💡 区分:

  • to + 动词原形 → 表目的(为了做某事)
  • for + 名词 → 表目的(为了某样东西)

例:I'm here to learn. / I'm here for the lesson.

Sources

Blog / Website:

  1. Infinitive of purpose – British Council LearnEnglish
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