suppose 意为“认为，猜测”，后常接“宾语+宾语补足语”形式。suppose sb./sth. to have done 的结构。
扩展资料
例如：
They supposed the paper to have been lost during the war. 他们认为那个文件在战争期间丢失了。
The police arrested him because he was supposed to have killed the lady. 警察逮捕了他，认为他杀死了那位女士。
suppose 可用于“ be supposed +不定式”的结构。
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。
例如：
We are supposed to help each other. 我们理应互相帮助。(要求)
You are supposed to hand in your papers before class is over. 希望你下课前交卷子。(期望)
