1. 在when,whenever,while,until,as soon as等引導(dǎo)的時(shí)間狀語從句中,可以省略與主句中主語相同的主語和系動(dòng)詞或助動(dòng)詞。
When (he was) a child he ran wild. 他小的時(shí)候很不守規(guī)矩。
They were scolded whenever (they were) late for school.每次上學(xué)遲到,他們都要挨罵。
While (he was) in prison,he wrote his first novel.他在獄中寫出了第一部小說。
As soon as (I am) on board I always feel sick. 我一上船就感到惡心。
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2. 在if,unless,once等引導(dǎo)的條件狀語從句中。
If (it is) not well organized,the meeting will be a failure.如果組織不好,會(huì)議就會(huì)失敗。
Substances have no tendency to expand unless(they are) heated.除非受熱,物質(zhì)不會(huì)有膨脹的傾向。
Once (she was) inside her bedroom,she began to cry. 一走進(jìn)臥室,她就開始哭。
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3. 在where,wherever引導(dǎo)的地點(diǎn)狀語從句中,可以省略主語和系動(dòng)詞或助動(dòng)詞。
Through long power lines,electricity goes where (it is) needed.電通過輸電線輸送到需要它的地方去。
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4. 在than,as引導(dǎo)的比較狀語從句中。
Ｓhe works better than Ｉ (works). 她工作做得比我好。
I’d rather play football than (I’d rather) go swimming. 與其去游泳我還不如去踢足球。
Run as fast as you can (run). 你能跑多快就跑多快。
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5. 在“the+比較級,the+比較級”的句型中。
The greater the force of action (is),the greater the force of reaction (is).作用力越大,反作用力也越大。
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6. 在whatever,however引導(dǎo)的讓步狀語從句中,可以省略系動(dòng)詞。
He was determined to carry out the plan,whatever the cost (was).他決心執(zhí)行計(jì)劃,不管代價(jià)如何。
However difficult the task (may be),we must finish it on time.不管這任務(wù)有多難,我們都必須按時(shí)完成。
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7. 在“no matter+疑問詞”引導(dǎo)的讓步狀語從句中,可以省略系動(dòng)詞be和重復(fù)的主語。
Anyone,no matter who (he is),may point out my shortcoming.不管是什么人,誰向我指出缺點(diǎn)都行。
Anyone who commits a crime must be punished no matter what his position (is).任何犯罪的人都必須受到懲罰,不管他地位多高。
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8. 在though,as though,as if引導(dǎo)的讓步狀語從句中。
Though (he is) tall, he is very weak in health. 他雖然長得高,但身體卻很弱。
He went quickly out of the room as if (he was) in a hurry.他很快走出房間,好像很匆忙似的。
