我国的英语著作毫无例外地认为,在动词宾语从句中if与or not是水火不相容的,绝不能同时并用。例如,《现代英语惯用法词典》(费致德编,商务印书馆,1982,P.458)认为,在宾语从句中,“Whether有时加or not,if不加”。《英语惯用法辞典》(葛传(规木)编,时代出版社,1962年,P.308)则进一步指出:“最好不说‘I asked him The English writings in our country, without exception, think that if and or not are incompatible in the verb object clause, they must not be used together. For example, the Dictionary of Modern English Dictionaries (Ph.D. ed., The Commercial Press, 1982, p. 458) argues that in the object clause, “Whether sometimes plus or not, if not.” “Dictionary of English idioms” (Ge Chuan (rule wood) series, Time Publishing House, 1962, p. 308) further states: “Better not to say” I asked him