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Chapter 12: Conditionals

条件句

Learn about zero, first, second, third, and mixed conditionals.

了解零条件、第一条件、第二条件、第三条件和混合条件。

解释 Explanation

Conditionals express situations that depend on other situations.

**Zero Conditional:** General truths, facts.

  • Form: If + present simple, present simple
  • Example: If you heat water to 100°C, it boils.

    • **First Conditional:** Real possibilities in the future.

  • Form: If + present simple, will + verb
  • Example: If it rains, I will stay home.

    • **Second Conditional:** Hypothetical, unlikely present/future.

  • Form: If + past simple, would + verb
  • Example: If I won the lottery, I would travel.

    • **Third Conditional:** Past hypothetical, impossible.

  • Form: If + past perfect, would have + past participle
  • Example: If I had studied, I would have passed.

    • **Mixed Conditional:** Different time frames.

  • Past condition → present result: If I had eaten breakfast, I wouldn't be hungry now.
  • Present condition → past result: If I were rich, I would have bought that car.

    • If vs Unless:

  • Unless = if not
  • Example: I will go unless it rains. = I will go if it doesn't rain.

    • inversion (formal):

  • Should you need help, call me.
  • Had I known, I would have come.
    • 中文翻译

    条件句表达依赖于其他情况的情景。

    零条件句：一般真理，事实。

    - 形式：如果 + 现在简单式， 现在简单式

    - 例子：如果你将水加热到100度，水就会沸腾。

    第一条件句：未来真实的可能性。

    - 形式：如果 + 现在简单式， 将 + 动词

    - 例子：如果下雨，我会呆在家里。

    第二条件句：假设的，未来不太可能发生的情景。

    - 形式：如果 + 过去简单式， 将 + 动词

    - 例子：如果我中了彩票，我会去旅行。

    第三条件句：过去的假设，已经不可能发生的情景。

    - 形式：如果 + 过去完成式， 将 + 动词 + 过去分词

    - 例子：如果我学习了，我会通过考试。

    混合条件句：不同的时间框架。

    - 过去条件与现在结果：如果我吃了早餐，我现在不会饿。

    - 现在条件与过去结果：如果我富了，我会买那辆车。

    如果 vs 除非：

    - 除非 = 如果不

    - 例子：我会去，除非下雨。 = 我会去，如果不下雨。

    倒置（正式）：

    - 如果你需要帮助，请叫我。

    - 如果我知道，我会来。

    关键话题 Key Topics

    Zero conditional(零条件句)First conditional(第一条件句)Second conditional(第二条件句)Third conditional(第三条件句)Mixed conditionals(混合条件句)

    练习题目 Practice Items

    Example Zero: general truths and facts
    零：一般真理和事实
    Example First: real future possibilities
    首先：真正的未来可能性
    Rule Second: hypothetical/unlikely situations
    第二：假设/不太可能的情况
    Example Third: impossible past situations
    第三：不可能的过去情况

    练习 Exercises

    1. Which is First Conditional?

    2. Which is Second Conditional?

    3. Complete: If I _____ (study) harder, I would pass.

    4. Which is Third Conditional?

    5. Complete: _____ it rains, I will stay home.

    ← Reported SpeechWord Formation →