九年级中考复习whether和if区别.docx

whether 和 if 区别 whether 和 if 都可以引导宾语从句，表示“是否”，在口语或间接引语中两者可以互换使用。如： I wonder if / whether I can get some advice from you. Ask him whether / if he can come. 但在有些情况下，whether 和 if 的用法有一定区别。 whether 引导的从句常可以与连词or 或 or not 直接连用，而if 一般不能。如： 正 ： Let me know whether you can come or not. 误 ： Let me know if you can come or not. 当宾语从句提到句首时，只能用whether 引导，而不能用if。如： 正 ： Whether it is true or not, I can’t tell. 误 ： If it is true or not, I can’t tell. whether 可以引导带to 的不定式，if 则不能。如： 正 ： I don’t know whether to accept or refuse. 误 ： I don’t know if to accept or refuse. whether 及其引导的成分可放于介词之后，作介词的宾语，但if 不能。如： 正 ： I worry about whether I hurt her feelings. 误 ： I worry about if I hurt her feelings. whether 可以引导从句，作主语、表语或同位语，而if 不能。如： 正 ： It was uncertain whether he would come. 误 ： It was uncertain if he would come. 正 ： His first question was whether Tom had arrived yet. 误 ： His first question was if Tom had arrived yet. 正 ： We must consider the question whether we will take these measures. 误 ： We must consider the question if we will take these measures. 强化练习： The question has not been answered Taiwan will be included on the Olympic torch relay route. that B．whether C．which D．if You have not yet answered my question I can join in the party tonight or not. whether B. if C. that D. which — I d like to invite you to a party this evening. — Thank you, but I’ll be free I m not sure at the moment. A. while B. if C. when D. whether 4．---What are you anxious about? --- A. If we succeed B.That we can succeed C. Do we succeed D.Whether we can succeed Only when the painting decide the painting is worth buying. A. he sees, he can ,whether B. does he see, can he, if C. he sees, can he ,whether D. sees he, he can,that English is his favourite subject I asked him if B. I asked him that whether C. I asked him that D. I asked him which they’ll go to the Summer Palace the weather. If; depends on B. Whether; depends upon C. Whether; depended on D. If; depended upon It isn’t quite