be supposed to do sth与should的区别

be supposed to：(按规定，习惯，安排等) 应当，应该，强调的是外在的压力或者看法，是他人要求你应该如何做. 　 　例句：I have not seen it myself, but it is supposed to be a great movie. 这部电影我没看过，不过人们普遍认为很不错。 不准践踏草地。You are not supposed to walk on the...