be supposed to 和should用法上有什么区别

精选

be supposed to 和should都有“应该”的意思 ,有时可互换，但它们的用法也是有点不同。
1、be supposed to有人称和数的变化。侧重于强调“被期望”，就是说，大家希望你这样做但你不一定要这样做；也可用来表示劝告、建议、义务、责任等，相当于情态动词should。
2、should 没有人称和数的变化.既可指有责任或义务 “应该”做某事，也可指建议或劝告某人“应该”做某事，还可指推测某事或某情况“应该”会发生“等。语气更强烈。
如：
1). You are supposed to liten to your boss.
你应该听你老板的。
2).He is supposed to work hard.
他应该努力工作。
3). We should help each other. （表示责任）
=We are supposed to help each other .
我们应该互相帮助。
4). You should see a doctor.（表示建议或劝告）
=You are supposed to see a doctor .
你应该去看医生。
5).They should be there by now, I think. (表示推测）
我想现在他们都已经到了。

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.

be supposed to 和should都有“ 应该”的意思，后面都是跟动词原形,有时可互换。但它们的用法有点不同。 1、be supposed to 强调客观上，侧重于强调“被期望”，“猜想会....... ”常用于被动语态中。有人称和时态的变化。 2、should 主观上的原因 ，“应该……”。没有人称和时态变化。 如： 1). You are supposed to come here on time. =You should come here on time . 2). You should get up earlier . 3). He is supposed to introduce himself first . = He should introduce himself first . 4).The train was supposed to arrive half an hour ago. 火车本应在半小时之前到达。