名词性从句

这是一个名词性从句的思维导图，详细的介绍了主语从句、宾语从句、表语从句三种句型，总结全面，直观明了，适合收藏下来学习哦！

名词性从句

• 主语从句
  • that做引导词时只起连接作用，在从句中不作成分，但是that不能省略。 eg：That the earth moves around the sun is known to all.
  • Whether if 引导的主语从句，whether 可放在句首或句尾，if只能放在句尾，whether if在从句中都不做成分。
  • 连接代词what who which whose whatever whoever whichever等在句中做主语宾语表语或定语 eg：What he said just now is true.
  • 连接副词when where why how在从句中做状语
    • When we will go for a picnic.
    • Why dinosaurs suddenly disappeared still remains a mystery.
  • 用it做形式主语
    • it+be+形容词+that从句
    • it+be+名词词组+that从句
    • it+be+过去分词+that从句
• 宾语从句
  • 动词的宾语从句
    • 一般紧跟在及物动词后，但也可以用it做形式宾语，把宾语从句放句末，一般宾语从句有宾语补足语是用估做形式宾语。
      • I just took it for granted that he'd always be around.
      • He suggested that they leave the hotel at once.
    • 有些动词如hate like own have等后跟宾语从句时，宾语从句前+it
      • Can you see to it that everyone knows the date of the meeting.
      • I hate it when they talk with their mouths full
  • 介词的宾语从句
    • 介词后也可用宾语从句，但that引导的宾语从句一般不直接跟在介词后，如果需要，用it做形式主语，然后再接
      • I worried about whether I hurt his feelings.
      • You may depend on it that I shall always help you.
• 表语从句
  • that whether引导的表语从句 二者只起连接作用，在从句中不做成分，that一般不能省略，whether和if不能互换
    • My decision is that all of us are to start at six o'clock tomorrow morning.
    • The problem is whether the meeting will be held.
  • as if as though引导的表语从句，可用陈述语气，也可用虚拟语气 eg：You look as if you have had a good time.
  • because引导表语从句时，主句主语不能用reason
    • You look tired.
    • That may be because I didn't have a good sleep yesterday evening.
  • wh-类的词引导的表语从句通常不含疑问含义，而是分别表示具体原因，时间和地点
    • That is why I left so early.
    • Tomorrow is when it be the most convenient.
  • 表语从句中用虚拟语气的情况，主句主语是advice demand order suggestion requirement request command等时，表语从句用虚拟语气，结构是should+动词原形，should也可省略。
    • My advice is that you should quit smoking.
    • His suggestion is that should set off at once.