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表語從句概念
在整個主句中充當表語這一成分的從句。
① He （主語）is not（系動詞） what he used to be（表語從句）.
隨堂練習
請找出下面句子中的表語從句
1. The question is when he can arrive at the hotel.
分析：
先找句子裡的謂語動詞，分別是is和arrive。Can不是動詞，是情態動詞，必須要和謂語動詞連用才可以。
一句話有且只有一個謂語動詞。這裡有兩個動詞，因此不是簡單句，是複雜句，複雜句由一個主句和一個或多個從句組成，有時會有兩個或以上主句出現，但是必須要有and這樣的連詞才可以，這裡沒有連詞，因此只能有一個主句，並且主句必須要出現。
如果句子裡有一個動詞，這個動詞就是主句裡的，如果有兩個動詞，一個一定仍然是主句的，另一個才是從句的。整個句子其實是The question is sth的結構，只不過這裡用when he can arrive at the hotel這個從句來代替sth這個表語，因此是表語從句。
Is是系動詞，根據「主系表」結構，is前面的成分是主語，後面的成分是表語。
2. The book is not what I need.
分析：
先找句子裡的謂語動詞，是is和need。一個謂語動詞在主句裡，另一個在從句裡。整個句子其實是The book is sth的結構，只不過這裡用what I need這個從句來代替sth這個表語，因此是表語從句。整個句子裡有個not，不影響結構，只是多了個否定的意思。
3. That is why she failed to pass the exam.
分析：
先找句子裡的謂語動詞，是is和failed。一個謂語動詞在主句裡，另一個在從句裡，整個句子其實是That is sth的結構，只不過用why she failed to pass the exam這個從句來代替sth這個表語，因此是表語從句。
4. The argument is whether it rains tomorrow.
分析：
先找句子裡的謂語動詞，是is和rains。一個謂語動詞在主句裡，另一個在從句裡，整個句子其實是The argument is sth的結構，只不過用whether it rains tomorrow這個從句來代替sth這個表語，因此是表語從句。
表語從句常用引導詞
that 在名詞性從句中只負責把從句引出來，不在從句裡充當成分，這點和在定語從句裡的用法不同，定語從句中that充當成分；
what 一般不用於定語從句，用在名詞性從句裡既引導從句，又在從句裡充當成分；
which 在名詞性從句裡含有「哪一個」的意思，通常有一定的選擇範圍，而在定語從句裡則沒有意思，只是引導句子和充當句子成分；雅思真題裡相關例句很少；
who 在從句裡充當成分，指人，不指物；雅思真題裡相關例句很少；
how 表示「如何」，可以用來表示程度；
whether 表示「是否」，不管是主語從句，表語從句，賓語從句裡都可以使用；
if 用法比較複雜，有多種限制，而且雅思真題裡相關例句很少。
劍橋真題例句
1. Another factor that may boost the prospects for AI in the near future is that investors are now looking for firms using clever technology, rather than just a clever business model, to differentiate themselves.(C5P72L22)
2. The critical question now is whether this can become the norm, rather than the exception. (C5P87L41)
3. This is what would have made the whole thing work. (C10P73L25)
4. This was how, in 1660, the renowned French grammarians of the Port-Royal abbey near Versailles distilled the essence of language, and no one since has celebrated more eloquently the magnitude of its achievement. (C11P97L12)
表語從句填空題
1. The resulthas been many people in these regions have turnedto outside supplies of rice and other foods. (C5P86L28)
2. The nextfactor to be determined is the goals should be assigned by a manageror collectively set in conjunction with the employees. (C6P68L28)
3. However, moreoften than not now, due to a rapidly changing climate, that is not happens.(C11P19L4)
4. The surveyalso assessed independent people over 65 were, and againfound a striking trend. (C6P44L30)
Key：that；whether；what；how
表語從句單選題
1. To tell you the truth, this is _____ in theworld.
A. which I have B.that I have C.what I have D. whether I have
2. Part of the reason Charles Dickens loved hisown novel, David Copperfield, was _______ it was rather closely modeled on hisown life.
A. what B. that C. why D. whether
3. This museum is not ______ it was ten yearsago.
A. that B.when C. which D. what
4. Grandma pointed to the hospital and said, 「That’s_____ I was born.」
A. when B. how C. why D. where
5.The mountain is no longer ________it used tobe.
A. which B.that C. as D. what
6. The biggest question is _____ will takecharge of the company.
A. whether B. that C. who D. if
7. I』d like to start my own business—that’s I』d do if I had the money.
A. why B.when C.which D. what
8. Great changes have taken place everywhere inthe city. It is no longer _____ it was 20 years ago.
A. what B. how C. that D. which
9. The trouble is ______ we can get there ontime.
A. what B. that C. how D. whether
10. See the flags on the top of the building? Thatwas ____ we did this morning.
A. when B. which C. where D. what
Key:
1-5: CBDDD 6-10: CDADD
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