条件状语从句基本用法-勤学培训网

　　►if与unless的用法:

　　if和unless都是引导条件状语从句的连词，考生尤其应注意unless的用法，因为它表示反面条件相当于if not“如果不、除非”。例如:

　　Even if automakers modify commercially produced cars to run on alternative fuels，the cars won't catch on ina big way unless drivers can fill them up at the gas station.

　　尽管汽车生产商将商用汽车改装，使之可以依靠替代燃料运行，但除非这种燃料可以在加油站添加，否则，这种改装的汽车不会大规模流行起来。

　　In debating，one must correct the opponent's facts，deny the relevance of his proof, or deny that what he presents as proof,if relevant，is sufficient.

　　在辩论中，必须纠正对方辩手陈述中出现的错误，否认其论据的相关性，或者否认其提供的信息可以作为论据的可信性，假如对方辩手提出的论据具有相关性，则否认其充足性。

　　►复合连词(as long as, so long as, as far as, on condition that, in the event that)，动词及分词provided/providing ( that) , given that, suppose/supposing ( that) , assuming, say等引导条件状语从句。例如:

　　If left alone by humans，the forests can regenerate，as long as there are seed trees in the neighborhood and the soil has not lost all its nutrients.

　　假如没有人类，森林可以再生，只要附近有种子树种，土壤也没有丧失全部的养分。

　　You can arrive in Beijing earlier for the meeting provided you don't. mind taking the night train.

　　假如你不介意乘坐夜班火车，你可以提前些到达北京参加此次会议。

　　Assuming he is diligent in his studies at ordinary times，he is sure to pass the test.

　　假如他平时勤奋学习，考试就一定会及格。

　　In the event that she has riot been informed，I will tell her.

　　假如没人通知她，我会告诉她的。

　　You can go swimming on condition that you don't go too far from the river bank.

　　只要你不离开河岸太远，你就可以去游泳。

　　Suppose it rained，we would still go.

　　如果当时下雨了，我们还是会去。

　　Say it were true，what would you do about it?

　　假如那是真的，你会怎么做?

　　►祈使句表示条件。例如:

　　Talk to anyone in the drug industry，and you'll soon discover that the science of genetics is the biggest thing to hit drug research since penicillin was discovered.

　　假如你与制药业的任何人交流，你会发现自青霉素被发现后，影响药物研究的大事件就是基因科学了。

　　Dress warmly，or else you'll catch cold.

　　穿暖和点，否则你会感冒。

　　Hurry up，or the tickets will have been sold out by the time we get there.

　　快点，否则当我们赶到那儿时，票就售完了。

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