《英语知识》1999年第11期上刊载的《再谈whether 和 if》一文中有:“8.whether 后可跟 or not,if 则不能。He wants to know whether or not we want din-ner.He wants to know whether we want dinner ornot.He wants to know if we want any dinner”当 if 和 whether 作连词引导从句,意为“是否”时,一般情况下均可互用。如:I wonder if/whether I can catch the last bus.但是,一旦与 or not 连用,依传统语法(或部分 In the article “Wrote about if and if” published in the 11th issue of English Knowledge, 1999, there is: “8. Whether you can follow or not, if you can’t. He wants to know whether or not we want din-ner. ”He wants to know if we want dinner or not. He wants to know if we want any dinner.“ When if and whether are used as conjunctions to guide clauses, meaning ”whether" or not, they can be used interchangeably under normal circumstances. Such as: I wonder if/whether I can catch the last bus. But once used with or not, according to the traditional grammar (or part