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词组 If you should do/If you do
释义
If you should do/If you do     

【问】 “What can I do for you? ”“ If you____see Mr. Allen,give him my regards. ”
 A. should B. would C. shall D. will
 答案规定选(A),但我不明白为什么要选(A)。If you see Mr.Allen. give him my re-gards.不是很规范的英语句子吗?
 【答】 if+动词现在时,是规范的英语真实条件从句。同样,if+should+动词不定式,也是规范的真实条件从句。两者的区别,仅仅在于后者增加了条件的不确定性。
 1.
 2.
 3.
 在句(B)中,如果主句是一个祈使句,如你所提出的试题那样,常常用于表达礼貌地请
 求或建议:
 1. If he should call,tell him I'll ring back.(LED)
 要是他来电话,请告诉他我将给他回电话。
 2. If you should be passing,do come and see us. (Eckersley)
 要是你路过这儿的话,就来看我们吧。
 3. If you should see Celia,give her my best wishes. (PEU)
 要是你见到西莉亚,请代我问候她。
 4. If you should be interested in our offer,please contact us.
 如果您对我们的报价感兴趣,请与我们联系。
 5. Should there be a fire,walk,don’t run,to the nearest exit.
 一旦着火,不要奔跑,要走到最近的安全门去。
 请做下面的英语试题:
 I know that it will be difficult to pick him out in such a crowd,but if you____happen tosee him,give him this packet.
 A. would B. might C. should D. could


赵振才 编著.英语常见问题解答大词典.哈尔滨:黑龙江人民出版社.1998.第1046-1047页.
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