我哪知道你在等我

I supposed him in the office.

我想他在办公室。

3）suppose + it +形容词 / 名词+ to do 的结构。

I don’t suppose it occurred to you to notify the police.

我看你没想过要去通知警察。《柯林斯高阶英汉双解学习词典》

I suppose it my duty to help those in poverty. 我认为帮助那些处于贫困中的人是我的义务。

2. suppose 可用于“ be supposed +不定式”的结构。

1） be supposed to do sth. = should do sth. 意为“应该 / 理应做某事”，表示被期望或被要求(按规则、惯例)做某事。按规定、习惯、安排等）应当，应，该，须；一般认为；人们普遍觉得会：

You’re supposed to buy a ticket, but not many people do.

按说应当买票，不过买的人不多。

I thought we were supposed to be paid today.

我以为我们今天会领到薪水呢。

You were supposed to be here an hour ago!

你本该在一小时以前就到这儿！

How was I supposed to know you were waiting for me?

我哪知道你在等我？

We are supposed to help each other. 我们理应互相帮助。

You are supposed to hand in your papers before class is over. 希望你下课前交卷子。

I was supposed to be writing a letter but I’m afraid I got sidetracked.

我本来应该在写信，但后来恐怕是分心干别的去了。

He produced a handwritten list of nine men he was supposed to kill

他拿出了一份手写的名单，上面列有9个他应该要杀死的人。

《柯林斯高阶英汉双解学习词典》

These new friends of hers are supposed to be very rich.

她的这些新朋友想必都很富有。