GMAT句子改错知识点(初级):If Then结构
日期:2014-07-27 21:25

(单词翻译:单击)

使用if 的句子一定都是虚拟语气。而if 和then 的结构有多种形式:

◆ IF you study diligently, [THEN] you will score highly.

◆ You will score highly IF you study diligently.


Then 在虚拟语气中常常被省略,同是if 也不见得都在首句中出现。下面是常见的if then 的五种结构(在这五种结构中不能在if 引导的句子中出现would ,而且一整句话都不能出现should 在if then 结构中):

1. 不存在不确定性的情况:

◆ IF Sophie EATS pizza, THEN she BECOMES ill.

◆ IF Present, THEN Present.


这种情况比较像whenever :WHENEVER Sophie EATS pizza, she BECOMES ill.

2. 存在一些不确定性的情况:

◆ IF Sophie EATS pizza, THEN she MAY BECOME ill.

◆ IF Present, THEN Can or May.


3. 将来时不存在不确定性

◆ IF Sophie EATS pizza tomorrow, THEN she WILL BECOME ill.

◆ If Sophie HAS EATEN pizza, then she WILL BECOME ill.

◆ IF Present, THEN Future.


4. 将来时不太可能发生

◆ IF Sophie ATE pizza tomorrow, THEN she WOULD BECOME ill.

◆ IF Hypothetical Subjunctive, THEN Conditional.

这里作者认为Sophie 不大可能吃pizza,这里用到了would,这里的would 可以用could 来替代。


5. 从不可能发生

◆ IF Sophie HAD EATEN pizza yesterday, THEN she WOULD HAVE BECOME ill.

◆ IF Past Perfect, THEN Conditional Perfect.

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重点单词
  • scoren. 得分,刻痕,二十,乐谱 vt. 记分,刻划,划线,
  • conditionaladj. 有条件的,假定的,假设的 n. [语]条件句
  • diligentlyadv. 勤奋地
  • hypotheticaladj. 假设的,假定的,爱猜想的