You'd better not stay up late at night.
You'd better not read in the sun .
Don't throw litte around.You must造3个肯定句 You must not, Don't, You'd betternot, You shouldn't 是每个造一个否定句加起来一共7句 谢谢原题就是这吗？感觉那么别扭You must三个肯定句的单词.putlitter into the dustbin .do morning exercises.brush your teeth twice a day You must not, Don't,You'd betternot, You shouldn't 的单词是stay up late at night. read in the sun throw litte aroundYou must put litter into the dustbinYou must do morning exercisesYou must brush your teeth twice a day You'd better not read in the sun Don'tthrow litte aroundYou'd better not stay up late at night Don't stay up late at night