限定從屬分句就是我們傳統(tǒng)意義上的從句。從句依附于主句?，不能獨立成句但是具有主語與謂語部分。
從句內容的分類
1. 從句作為主語
例：What he needs is some rest.
如果從句過長，需要用it作形式主語?。
例：Whether technology can be considered as the “motor of society” is a chicken and egg debate.
如果將從句用作主語的話，容易造成頭重腳輕的感覺，這時候需要用it做形式主語，改成
It is a chicken and egg debate whether technology can be considered as the "motor of society”.
2. 從句作直接賓語?（與謂語動詞的關系不如NP緊密，可插入其它成分）
①decide that…
例：We decided that we would do it together.
②wonder whether/if/wh- phrase…
?例：I wonder whether/if I am good enough.?? ??
I wonder who did not come to work.
③mention to NP that…?（這里的to NP是一個可省略的補語，that從句才是直接賓語。）
?例：He mentioned (to me) that he was writing it.
④tell NP that…（這里的NP是間接賓語；that...從句是直接賓語?）
例：She told me that she had started her application.
可以將間接賓語變成主語，改為：I was told that she had started her application.
⑤ask/show/teach/tell NP whether/if/wh-phrase…
例：I asked her whether she would like to join us.?? ??
He told us what a great job we had done.?? ??
The mother is teaching her boy what to do.
⑥consider it NP/AdjP that/wh-phrase…（這里的it是形式賓語）
例：Some scientists consider it possible that AI would take the interpreters’ places one day.?? ??
We consider it a major concern how the problem is dealt with.
3. 從句作補語從句
由謂語動詞引出的，但是不屬于直接賓語、間接賓語或表語補足語的從句被稱為補語從句。
①persuade NP that…
例：We persuaded them that we could do it.
②remind NP whether/if/wh-phrase…
?例：It reminds me whether I am on track.
③It seem (+PP) that/as if…
例：It seems (to me) that there is still enough room.
4. 作為主語相關的表語補足語?句式：be that/wh-phrase…
?例：The first myth is how this is possible.?? ??
What I wonder is whether we could finish it.
5. 從句作為修飾語—用于在省略if時標記該分句為從句：?（一般需要倒裝?）
例：Had I spent more time on study, I should now be doing my PhD.?? ??
Should I be accepted, I will spare no efforts to do researches.
關系從句/定語從句的作用：?提供與先行詞相關的信息
關系從句的分類
1. wh- 從句
關系代詞：?who, whom, whose, which?其它：when, where, why
例：In the period when he was writing, he reached the climax of his career.
?There is no fixed place where it is kept.?The reason why… is because…
which可以修飾整個主句
例：In the presence of so many people he was little tense, which was understandable.
2. 非wh-從句（即that從句）
例：The work that we do is nothing special.
3. 限定性定語從句和非限定性定語從句
非限定性從句有逗號隔開?比較：The pizza which you ordered is finished.?Peter, whom you met in London, is now back in Paris.
that只用于限定性定語從句，which則二者皆可
4. 自由定語從句?
自由關系代詞用于自由關系從句（取代NP的位置）。它的特點是沒有先行詞。
What > who(m), which
例：What you do is just to switch it off.
whatever, who(m)ever
例：Is it worth complaining to whoever was in charge?
掌握好從句的用法，是寫好一篇文章的基礎。上述內容將介紹了兩類從句的基本內容和用法，將上面的內容掌握好，對自己雅思寫作的基礎做個鋪墊。
