2009年高考英語語法精要講解三十七：主語從句
    主語從句三要素：
    1、關聯(lián)詞不能省略
    2、謂語動詞用單數(shù)
    3、從句用陳述語序
    常見引導詞
    what, when, where，which, who, that，whether, how ，whatever, whoever
    Whether it will do us harm or good remains to be seen.
    I don’t think that whatever happens is right.
    Is what you told me really true?
    NOTICE: What we need most are books.