释义：
be supposed to... ……应当做某事
be supposed to+动词表示“应当……”，“将……当成理所当然的事情”。会话中经常会用到的表达。下面整理了 be+过去分词... 的形态。
例句：
Am I supposed to meet the client today?
我今天要见顾客吗？
I am not supposed to be here.
我不应该在这里。
When is he scheduled to arrive at the airport?
他预计什么时候到机场？
I'm not interested in playing golf.
我对打高尔夫球不感兴趣。
对话：
A: When is the show supposed to start?
表演什么时候开始？
B: Just after seven o'clock.
7点准时开始。
