动词：猜想；假设，假定；认为（某事物是可能的）

1. suppose + that 从句，表示“猜测；假定”。

I suppose that you are right. 

我想你是对的。 

2. suppose +名词 / 代词 + to be...，表示“认为……是……”。

Many people suppose him to be over 50. 

许多人认为他已经50多岁了。 

3. suppose用于祈使句中，表示“让……”。

Suppose we go for a swim. (= Let's go for a swim.) 

让我们去游泳吧。 

注意：be supposed to do的用法 

①sb. be supposed to do，意为“应该…… ”；“被期望……”，表示劝告、建议、义务、责任等，相当于情态动词should。

Everyone is supposed to wear a seat-belt in the car. 

每个人在汽车里都应该系安全带。 

②sth. be supposed to do，表示“本应；本该”，用于表示“某事本应该发生而没有发生”。

The train was supposed to arrive half an hour ago. 

火车本应在半小时之前到达。 

③be supposed to+have + 过去分词，表示“本应该做某事而没做”。 

You are supposed to have handed in your homework by now. 

现在你应该已经把作业交上来了。