whether和if都可以引导宾语从句[综合材料].doc
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whether和if都可以引导宾语从句[综合材料].doc
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。 1. 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. 2. 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 cant tell. 误: If it is true or not, I cant tell. 3. whether可以引导带to的不定式,if则不能。如: 正: I dont know whether to accept or refuse. 误: I dont know if to accept or refuse. 4. 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. 5. 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.whether 和if 可以互换吗?在哪些情况下可以呢下面的几个情况可不可以?"Have you seen the film?" He asked me.he asked me whether I had seen the film."Youve already got well, Havent you?" she asked.she asked whether I had a already got well.He asked, "Are you a Party member or a League member?"He asked me If I was a Party member or a League member,这三个都做“是否”讲 是可以互换的 下面的情况不能互换: 1Whether可以与or not 连用构成whetheror not或者whether or not,但if一般没有这种用法。 2如果宾语从句是否定结构,则用if,而不用whether。 3介词的宾语从句只能用Whether引导。 4、引导主语从句、表语从句、同位语从句时都用whether。 5Discuss 或decide 等动词后,通常只跟whether引导的宾语从句,而不跟if引导的宾语从句。 6 Whether后面可以接不定式短语,而if不能 。 7在主从复合句中,为避免产生歧义,不用if而用whether,而使意义更加明确。2综合a类