2020屆高考英語省略句復習
【正】the old machine must be checked before being used.
he told me the truth after he was asked three times. 問了他三遍他才告訴我真相。
【誤】he told me the truth after asked three times.
【正】he told me the truth after being asked three times.
②以as if, as though等連詞引導的方式狀語從句
she lay there, as if (she was) dead. 她躺在那兒，好像死了。（省略的主語和主句的主語一致）
he opened his lips as if (he were going) to say something. 他張開嘴唇，好像要說什么話似的。
③以if, unless等連詞引導的條件狀語從句
we shall start at eight, if (it is) convenient. 如果方便的話，我們八點鐘出發。
correct the mistakes in the following sentences, if (there are) any. 如果下面句子中有錯，請加以改正。
english words are easily forgotten unless (they are) constantly repeated. 英語單詞不經常重復是很容易忘記的。
④以even if, even though, though, although, whether等連詞引導的讓步狀語從句
frost is possible, though (it is) not probable, even at the end of may. 甚至在五月底下霜也是可能的，雖然可能性不太大。
whether (it is) difficult or not, we will try our best to complete the task. 不管任務是否艱巨，我們都要盡力去完成。
whatever the cause (may be), the result is certain. 不論原因是什么，結果是確定的。
though (he is) young, he knows a lot. 他雖然年輕但懂得很多。
提示：
在這類從句中，如果be是助動詞，后面跟著現在分詞或過去分詞，只要主語和從句中的主語相同，也可以把從句中的主語和助動詞be省略掉。
he hurt his leg while (he was) riding a horse. 他在騎馬時傷了腿。
when (you are) cycling, don't forget the traffic lights. 騎車時，不要忘記看紅綠燈。
once (it is) seen, it can never be forgotten. 一旦看見，就永遠不會忘記。
if (it is) burnt, rubber can give off a poisonous gas. 橡膠如果燃燒起來，會發出有毒氣體。
4.在比較從句中通常把和主句重復的部分省掉。
①省略謂語的全部
james enjoys the theatre more than susan. 詹姆斯比蘇姆更喜歡戲劇。（susan后省略了enjoys the theatre）
tom has as many books as jack. 湯姆有跟杰克一樣多的書。（jack后省略了has many books）
②省略主語和謂語的一部分
brown speaks french as fluently as english. 布朗說法語和英語一樣流利。（as后省略了he speaks）
she was more angry than frightened. 與其說她害怕，倒不如說她生氣。（than后省略了she was）
③省略表語部分
mrs white is not so young as she looks. 懷特夫人沒有看上去那樣年輕。（looks后省略了young）
the situation is much more delicate than it seems. 情況要比表面上看起來微妙得多。（seems后省略了delicate）