(1)否定句:主语+情态动词+not+be+及物动词的过去分词(+其他)。如: The flowers mustn't be watered at noon.中午时一定不要给花浇水。 This problem can't be worked out very easily.这道题轻易算不出来。 (2)一般疑问句:情态动词+主语+be+及物动词的过去分词(+其他)。如: —S...