条件状语从句用法.docVIP

1.条件状语从句A.状语从句：在复合句中，由从句表示的状语叫做状语从句。它可以用来修饰主语中的动词.形容词.副词，以及全句等。根据它表达的意思，状语从句可以分为时间状语从句，地点状语从句，条件状语从句，比较状语从句，目的状语从句，结果状语从句和让步状语从句等。B.条件状语从句：表示“在某种条件下,会”主要连词有if, unless, as/so long as只要, on condition that在条件下,如果, provided假如, suppose假设，如果, supposing假如，in case（以防，以免，万一）等。.C.条件从句不能用将来时，规则是“主将从现”。主句过去将来时，从句一般过去式。If it dosent rain tomorrow, we will go to the zoo.If you open the door，I will come in. Lets go out for a walk unless you are too tired.（unless = if not）= If you are not too tired, lets go out for a walk.So long as youre happy, it doesnt matter what you do.You may borrow my book as long as you keep it clean.Take your umbrella in case it rains. You will be late unless you leave immediately.If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。 I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保守秘密。on condition (that).引导的条件从句是主句事件发生的前提条件或唯一条件。 Supposing it rains, shall we continue the sports meeting?表示一种假设条件。倘若下雨,我们的运动会还要继续举行吗? He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。（表示一种假设条件。）注意： but for若非,要不是=without (连接的不是句子，是短语) But for the rain, we should have a pleasant journey.要不是下雨,我们旅行肯定会很愉快。 Without your help, we should not have finished in time.要不是你帮忙,我们肯定不能及时完成任务。2.集体名词：people, police作主语时谓语动词用复数，集体名词family, class, team government crowd committee party firm couple，group enemy union audience mankind humanity youth(青年人)等作主语时，看作一个整体时，谓语用单数；如果指这些集体的各个成员，谓语用复数。The police are looking for him. My family is a large one. My family are all workers.3. however与but “可是.但是”1)but是并列名词，连接两个并列分句，必须在第二句的开头。二句在总的意义上对比.。however不能连接两个分句，必须另起新句，并用逗号隔开，可在句中，句首或句末，2).however比but用的场合更正式.，用于书面语,折性语气较弱；而but常用于 口语,转折语气较强.3) however还可表示“无论如何，不管怎样”，but不行。eg: I really dont like cheese，but I will try just a little this time.我实在是不喜欢吃奶酪.但是这次我要尝一点.It was raining hard. However, we went out to look for the boy.雨下得很大,不过我们还是出去寻找那个孩子Ill come however busy I am.我不管怎么忙都会来的。4) fail v.无视；忘记 v.失败 failure n.失败a. fail+宾语失败做某事 b. fail in doing sth在某些方面失败c. fail to do没有能够做某事 d. not fail to do sth一定能做某事He fail to swim across the river. You can not fail to obey it.你一定会遵守。I can not fail to pass it.我一定会通过的。Failure is the mother of success.5) remind vt.使想记起,提醒(of, that, how) remind sb to do sth, remind sb of sth, remind sb that .Please remind me to leave her this note请提醒我留给她这张纸条Please remind me that I must call her up before nine.请提醒我九点前给她打个电话。The film reminded him of what he had seen inChina.这部影片使他回想起在中国所看到的一切。Note：remember记住，记得 remember sb to somebody.记得代某人向某人问好remember to do sth记得去做某事remember doing sth记得已经做了某事6）pay attention to ; notice; care ; take care of ; look afterpay attention to在思想上注意notice =see(眼睛看) care关心；在意take care