类型之三: 由 whether 或 if 引导的宾语从句。 含义都是“是否”的意思。 它们只起引导作用,不充当成分。 例如: 1 ) I want to know if he lives there. 2 ) He asked me whether I could help him.2. 2. 当宾语从句是一般疑问句时,由连词当宾语从句是一般疑问句时,由连词 whetherwhether 或或 ifif引导(口语中常用引导(口语中常用 ifif ),因为),因为 if/whetherif/whether 翻译成:翻译成:“是否”,具有一定的意义,所以不能省略“是否”,具有一定的意义,所以不能省略Lily wanted to knowLily wanted to know if /whetherif /whether her grandmaher grandma liked the handbag .liked the handbag .Let’s seeLet’s see if /whetherif /whether we can find out somewe can find out some information about that city .information about that city .She asked meShe asked me if /whetherif /whether she could borrowshe could borrow these books .these books .2. 当从句为一般疑问句时,连接词用 if 或 whether 。e.g. Is Alice 15 years old? I wonder…看从句的的类型I wonder if / whether Alice is 15 years old.More practice: I want to know: 他明天是否回来。 你是否喜欢可乐。由从属连词 whether, if 引导的宾语从句e.g. 1. I want to know if(whether) he will go to the park with us. (他是否跟我们一起去公园)2. Ask him whether(if) he can come. (他是否能来)3. I don’t know whether it is going to rain or not. (是否要下雨) 1 、当句末为 or not 时,引导词只能用 whether 而不能用 if.2 、在不定式前,引导词只能用 whether 而不能用 if.例如:I haven’t made up my mind whether to go there or not.If/whether 的用法主要区别点 : whether 可与 or (not) 连用I don’t know whether he will come or not.I don’t know if/whether he will come.If 与 whether 的区别1. I don’t know _____ he will come or not.2. I don’t care of ______ he is handsome.3. He wondered ______ to stay here the next week.4. ____ he will...