1. be supposed to do “应该；被期望”

The students aren’t supposed to take the books out of the library.

学生不应该把这些书拿出图书馆。

The train was supposed to arrive ten minutes ago.

火车应该在十分钟之前到达。

They are supposed to be very clever.

人们认为他们很聪明。

2. “suppose + that从句”表示“猜测；认为”。

I suppose (that) he is right.

我想他是对的。

The teacher supposes (that) his students can’t finish this work.

老师猜想他的学生不能完成这项工作。

3. “suppose＋名词/代词＋介词短语”表示“猜测某人/某物在……”。

He supposed his friend in the library.

他猜想他的朋友在图书馆里。

4. “suppose＋名词/代词＋to be”表示“猜想某人……”。

She supposed her sister to be in the park.

她猜想她妹妹在公园。

I supposed the girl to be a teacher.

我猜这个女孩是位老师。

5. suppose还可用于插入语中。

Who do you suppose called today? 你猜今天谁打过电话？

6. 在口语中，常用

I suppose so（我认为是这样）

I don’t suppose so/ I suppose not（我认为不是这样）。

I suppose so. = I think so.

I don’t suppose so. = I don’t think so.