什么是 "Be Supposed To"？
"Be supposed to" 是英语中一个非常常见的表达，用于表示：
- 应该做某事（义务、规则或期望）
- 被安排/计划做某事
- 普遍认为某事是真实的
基本结构
主语 + be (am/is/are/was/were) + supposed to + 动词原形
- You are supposed to wear a uniform at work.
- She was supposed to call me yesterday.
- We are not supposed to eat in the library.
常见用法与例句
-
表示义务或规则：
“You’re supposed to stop at a red light.”（红灯时你应该停车。） -
表示计划但未实现的事：
“They were supposed to arrive at 6, but they’re late.”（他们本该六点到，但迟到了。） -
表示普遍认知：
“This app is supposed to help you learn English.”（这个应用据说是帮你学英语的。）
注意事项
- “Be supposed to” 后面必须接动词原形。
- 否定形式常表示“不应该”或“不被允许”。
- 在口语中，“supposed to” 常被误读为 “s’posed to”，但书写时应保持完整形式。