英语主语从句用法与总结、句型结构、训练

2023-09-20 17:14:03来源:新东方在线

  一、主语从句的归纳总结

  主语从句是作为一个句子的主语的从句。它可以由名词从句(that从句)、疑问词从句和动词不定式从句等构成。常见的引导词有"whether", "if", "what", "how", "why", "who", "which", "where", "when", "that"等。

  1. that从句:如:"That he will come is certain."

  2. 疑问词从句:如:"What you said is true."

  3. 不定式从句:如:“To see is to believe.”

  二、主语从句的句型结构

  1. It is...that形式:

  当主语从句过长或者需要强调时,通常会用"It is...that"的形式。如:"It is important that you should remember these words." 在这个句子中,"you should remember these words"就是主语从句,而"It"是形式主语。

  2. 疑问词+不定式形式:

  使用疑问词(如"what", "who", "how"等)加上动词不定式来形成主语从句。如:"What to do next is the problem."

  三、主语从句的训练

  练习一:

  将下列句子改为主语从句形式:

  1. You have failed the exam. ---> That you have failed the exam is a pity.

  2. She will come on time. ---> Whether she will come on time is uncertain.

  练习二:

  补全下列主语从句:

  1. ___ he can finish the task on time is still unknown.

  答案:Whether

  2. It's clear ___ they have made a big mistake.

  答案:that

  通过理解主语从句的概念并大量练习,可以熟练掌握主语从句的用法。


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