be supposed to （表客观事实）VS be expected to （表被期望）

be supposed to do是被期望或要求、应该。相对于be expected to do 主观性强一些.它相当于should的这个用法：是有希望做（成）……

expect在朗文的第一词条即为：预料、期待。

例：They are expected to make an announcement later on today.(预料他们今天晚些时候会宣布一项通告)

再次例句中，be expected to do意为预料，表示一种可能性

再如：She is expected to be a good doctor.（他有希望成为一名好医生)

Soldiers are expected to obey their orders without question

军人应当绝对服从命令。 （被期望）

Soldiers are supposed to obey their orders without question

军人应当绝对服从命令。 （表客观事实）

be supposed to （表客观）vs Should (表主观)

be supposed to 表示“理应。。。。？”强调客观上，“猜想会....... ”常用于被动语态中

You are supposed to liten to your boss.

He is supposed to work hard.

should 表应该。。。。，强调主观上的原因

You should work hard to catch up with your classmates.

You shouldn't laugh at her.

1、be supposed to还有“据说”（=be said to)

Let's go and see that film.It's supposed to be very good.

2、计划、安排 The train was supposed to arrive at 11:30,but it was 40 minutes late.

3、be not supposed to 表示不允许等

You're not supposed to park here.