HelloWorld 发表于 4 天前

条件句类型

1. Zero 条件句(零条件句)

[*]结构(Form):
    If + 现在时,… 现在时
[*]用途(Usage):
    用于陈述普遍真理或恒常事实,类似科学定律或习惯性行为。
[*]例句(Example):
     1) If you heat water to 100°C, it boils.
     2) If people don’t eat, they get hungry.


2. First 条件句(第一条件句)

[*]结构(Form):
    If + 现在时,… will + 动词原形
[*]用途(Usage):
    用于将来真实可能发生或较大可能性的情况。
[*]例句(Example):
     1) If it rains tomorrow, I will take an umbrella.
     2) If she studies hard, she will pass the exam.


3. Second 条件句(第二条件句)

[*]结构(Form):
    If + 过去时,… would + 动词原形
[*]用途(Usage):
    用于与现在或将来相反的假想情况,表示不大可能或与事实相反。
[*]例句(Example):
     1) If I had a million dollars, I would buy a mansion.
     2) If she knew his phone number, she would call him.
     3) If I were you, I would apologize.(在正式场合,“were”用于所有主语)


4. Third 条件句(第三条件句)

[*]结构(Form):
    If + 过去完成时(had + 过去分词),… would have + 过去分词
[*]用途(Usage):
    用于对过去未曾发生的事情进行假设,并推测可能的结果。
[*]例句(Example):
     1) If he had studied harder, he would have passed the exam.
     2) If they had left earlier, they wouldn’t have missed the train.
     3) If I had known about the meeting, I would have attended.


小结(Summary)

[*]Zero 条件句:If + 现在时,… 现在时 → 恒真或习惯性事实
[*]First 条件句:If + 现在时,… will + 动词 → 未来可能发生
[*]Second 条件句:If + 过去时,… would + 动词 → 与现在或将来事实相反或假想
[*]Third 条件句:If + 过去完成时,… would have + 过去分词 → 与过去事实相反的假想
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