1、suppose 意為“認為，猜測”，後常接“賓語+賓語補足語”形式。suppose sb./sth. to have done 的結構。
例如：
They supposed the paper to have been lost during the war. 他們認為那個文件在戰爭期間丟失了。
The police arrested him because he was supposed to have killed the lady. 警察逮捕了他，認為他殺死了那位女士。
2、suppose 可用於“ be supposed +不定式”的結構。
be supposed to do sth. = should do sth. 意為“應該 / 理應做某事”，表示被期望或被要求(按規則、慣例)做某事。
例如：
We are supposed to help each other. 我們理應互相幫助。(要求)
You are supposed to hand in your papers before class is over. 希望妳下課前交卷子。(期望)
3、suppose 可用過去完成時表示“未曾實現的願望”。
例如：
We had supposed that we would be able to see more of Shanghai, but time didn't permit. 我們本打算能多看看上海，但時間卻不允許了。
註意：與 suppose 這種用法相同的還有： hope, think, expect, mean, want, intend, plan (壹些表示心理狀態的動詞)等。
4、suppose 可用於“ suppose + that (從句)”句型。
例如：
What makes you suppose (that) I'm against it? 妳根據什麽認為我反對這件事?
It was generally supposed that it would not happen again. 壹般認為此事不會再發生。
5、suppose 可用於簡略答語中，用 so 代替壹個肯定的賓語從句;用 not 代替壹個否定的賓語從句。
Do you suppose he'll fail to catch the train?妳認為他會錯過火車嗎?
I suppose so./ I suppose not. (= I don't suppose so. )我想會的。 / 我想不會。
註意：與 suppose 這種用法相同的還有： think, believe, expect, imagine 等。但應註意 hope 和 be afraid 則不同於以上的用法。