be supposed to是什么意思
be supposed to；翻译：应该；认为必须；被期望
1、I was supposed to meet her, but I spaced out and forgot.
2、They were supposed to be here an hour ago.
3、He was supposed to give us advice, but all he came up with were airy-fairy ideas.
be supposed to do 和be supposed to be doing 有什么区别?
be supposed to do 和be supposed to be doing 的区别在于动词不定式的形式不同。 具体分析： 1. be supposed to do ：应该干……；被要求干什么；理应做某事；应该。 to do是动词不定式的一般式，表示一般的情况，不强调具体的时间。动词不定式通常作为主语补足语。 举例说明： I am supposed to pick up a packet . 我应该拿一个包裹。 I am supposed to help them. 我应该辅佐他们。 "He is supposed to come at one," replied his friend. “他应该一点钟来。”他的朋友回答说。 Theoretically, the price is supposed to be marked on the shelf. 从理论上说，价格是要标在货架上的。 2. be supposed to be doing： 应该正在做什么事情；理应做什么。 to be doing动词不定式的进行时，强调动作正在发生或者进行着。 举例说明： It means that your provider's platform is doing what it's supposed to be doing. （表达正在进行的事情） 它还意味着提供商的平台只做应该做的事情。 Kate is watching TV when she is supposed to be sleeping.（应该和看电视的时间同时） 凯特本该在睡觉的时候却在看电视。 People look the other way - even people who are supposed to be working for the subway . （表示现行阶段正在工作） 人们期待其它的方法，甚至被以为在地铁工作的人。