在英语中,but 常用作连词、介词和副词,表示“但是”、“除了”、“仅仅”等意。然而在不同的句子结构中,but 的含意有时很不一样。一、用于否定结构之后 but 的意义是否定的,相当于 that...not,因此全句构成双重否定。例如:There is nothing so difficult but it becomes easy by practice.没有什么难 In English, but often used as conjunctions, prepositions and adverbs, said “But ”, “except ”, “only ” and so on. However, in different sentence structures, the meaning of but is sometimes very different. First, after the negative structure for the meaning of but is negative, which is ... not, so the sentence constitutes a double negative. For example: There is nothing so difficult but it becomes easy by practice