名詞作主語、賓語、表語、同位語轉化為從句，顧名思義，當一個句子作主語時就是主語從句
1. That she is still alive is a wonder.
That 引導主語從句起連接作用，不作成分，無詞義，不可省。
2. What you said yesterday is right.
What 引導主語從句在句子中作主語、賓語、表語，意為"所謂的""什麼東西".
3. Whether you go or not is up to you .
Whether 隻起連接作用，不充當成分，有是否之意，隻有在賓語從句中才能用if.
4. Who will attend the meeting hasn't been decided.
Who 引導主語從句時在句中作主語、賓語或表語。
5. Whose book it is unknown yet.
Whose 在主語從句中作定語。
6. when he will go to Shanghai is unknown to us.
連接副詞how, when, where, why 引導主語從句，分别作方式、時間、地點和原因狀語。
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