Noun Clauses名词性从句

名词性从句（Noun Clauses）是在句子中起名词作用的句子，其功能相当于名词词组，能在复合句中担任主语、宾语、表语、同位语、介词宾语等。

Noun Clauses

• simple sentence -> complex sentence
  • affirmative
    • that+从句
  • general question
    • whether+从句
    • if+从句
      • only object
  • special question
    • 疑问词+从句
  • 从句为陈述语序
• As Subject
  • 位置
    • 句首
    • 句尾
  • It 形式主语
    • It's + Past Participle + Noun Clause
    • It's + Adjective + Noun Clause
    • It's + Noun Phrase + Noun Clause
    • 3 examples
      • 一般 that 引导
  • 主谓一致
    • 一个主从，一个连词
      • Why he left is a secret.
    • 一个主从，多个连词
      • When and where we will go is not certain.
    • singular
    • 多个主从，多个连词
      • When they will move and where they will stay have not been decided yet.
      • plural
    • What & Who
      • What she wants are those books.
      • Who she loves are her parents.
• As Complement
  • 常用引导词
    • as
    • as if
      • 仿佛、好像，后常接虚拟语气
    • because+原因
      • 主句主语为the reason 时，用that
    • why+原因
  • 主句主语表要求、建议、命令
    • 表要求
      • request, demand, insistence, requirement
    • 表建议
      • idea, notion, advice, proposal, suggestion,recommendation
    • 表命令
      • order, instruction
    • 概要
      • 宾从的谓语动词 should (可省略)+ 动词原型
• As Apposition
  • 主句含抽象名称
    • idea, fact, news, truth, belief, doubt, thought, problem, decision, message, evidence, conclusion ...
• As Object
  • that
    • 可省略
      • 引导宾从
    • 不可省略
      • SVOO,从句为DO
      • It形式宾语，从句为真正宾语
        • I find it interesting that the moon is lemon-shaped.
      • V +接入语 + 宾从
      • 谓语动词中介词 + 宾从
      • 谓语动词 + 宾从1(可省略）+宾从2+...（不可省略）
      • 宾从的主语含this/that
        • Grace points out that that telescope belongs to Annie.
  • whether √ , if ×
    • whether or not连用
      • I can't tell whether or not he will come on time.
      • I can't tell if he will come on time or not.
        • 分开，if 可替代 whether
    • 不定式whether to do
    • 介词+ 宾从
    • 宾从在句首
      • Whether he leaves , I want to know.
  • 否定前移
    • 主句主语为第一人称
    • 主句谓语动词表心理活动
      • eg: know, think, guess, believe, expect, suppose, imagine...
    • 同时满足
      • I don't know that the earth is a sphere.
  • 主句谓语动词表要求、建议、命令
    • 表要求
      • eg: ask, insist, require, request, demand
    • 表建议
      • eg: advise,suggest,propose,recommend
    • 表命令
      • eg: order,command
    • 概要
      • 宾从的谓语动词 should (可省略)+ 动词原型