whether和if均可用来引导宾语从句.pdf

whether 和 if 均可用来引导宾语从 句 ，表示“是否”，如： dont know whether/if I will be able to come.我不知道我是否能来 . She asked me whether/if I was interested in working for her. 她问我是否 有兴趣为她工作 。 但也有差别： 1、w hether可以与 or 或 or not 连用，而 if 不可以，如： He wondered whether he should wait or go . H don ’tknow whether hewill come. or not 。 2 介词之后用 whether , 不用 if . It depends on whether you will agree . 3 不定式前面用 whether 不用 if . I wonder whether to stay here . 5 当从句或主句 放于句首时，用 whether ，不用 if . Whether this is true or not , I cant say . Whether Ill have time to go with you I am not sure 6 引导表语从句 用 whether ， 不用 if . The problem is whether we should go homeor not 8 作 discuss 的宾语，用 whether ， 不用 if . They are discussingwhether they should open the door 9、当表示“如果”时用 if, 而不用 whether 强化练习： 1. The question has not been answered ____ Taiwan will be included on the Olympic torch relay route. A ．that B ．whether C．which D ．if 2. You have not yet answered my question _____ I can join in the party tonight or not. A. whether B. if C. that D. which 3 ．— I d like to invite you to a party this evening. — Thank you, but _____ I ’ bell 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 5. Only when _____ the painting _____ decide ______the painting is worth buying. A. he sees,he can ,whether B. doeshe see,can he, if C. he sees,can he ,whether D. seeshe, he can,that 6. _____ English is his favourite subject A. I asked him if B. I asked him that whether