1.形容詞性(定語(yǔ))從句關(guān)系代詞的省略
(1)that, which 引導(dǎo)定語(yǔ)從句并在從句中做賓語(yǔ)時(shí)，可以省略。
(2)that引導(dǎo)定語(yǔ)從句并且從句是there be句型時(shí)，可以省略。如：
No one would have the time to read or listen to an account of everything there is going on in the world.
2.副詞性(狀語(yǔ))從句的省略
(1)虛擬語(yǔ)氣句省略條件連詞if，從句采用倒裝結(jié)構(gòu)。如：
Had it not been for the timely investment from the general public, our company would not be so thriving as it is.
(2)由although, as if, if, no matter wh-, once, though, unless, until, when, where, whether, while等連詞引導(dǎo)的表示時(shí)間、地點(diǎn)、條件、讓步、方式的狀語(yǔ)從句，可省略主語(yǔ)和助動(dòng)詞be,保留ing分詞、ed分詞或表語(yǔ)。這樣省略的條件是：●從句中被省略的主語(yǔ)必須與主句的主語(yǔ)一致;●謂語(yǔ)動(dòng)詞必須含有be;●從句必須與主語(yǔ)和b
e動(dòng)詞一起省去，不可只省略主語(yǔ)而保留整個(gè)謂語(yǔ)，也不可只保留主語(yǔ)而省略謂語(yǔ)。如：
Though raised in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life.
Although born in Chicago, the author is most famous for his stories about New York City.
One should never lose one’s heart when confronted with temporary difficulties.
3.比較從句中主語(yǔ)的省略
在這種省略結(jié)構(gòu)中，也可以把than或as當(dāng)成關(guān)系代詞。因?yàn)橹髡Z(yǔ)省略了，所以尤其要注意識(shí)別哪個(gè)詞是省略了的主語(yǔ)，進(jìn)而選擇謂語(yǔ)的數(shù)、時(shí)態(tài)和語(yǔ)態(tài)。
These proposals sought to place greater restrictions on the use and copying of digital information than exist in traditional media.
There ought to be less anxiety over the perceived risk of getting cancer than exists in the public mind today.
The project requires more labor than has been put in because it is extremely difficult.
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