例如：

　　They supposed the paper to have been lost during the war. 他們認(rèn)為那個文件在戰(zhàn)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(rèn)為他殺死了那位女士。

　　suppose 可用于“ be supposed +不定式”的結(jié)構(gòu)。

　　be supposed to do sth. = should do sth. 意為“應(yīng)該 / 理應(yīng)做某事”，表示被期望或被要求(按規(guī)則、慣例)做某事。

　　例如：

　　We are supposed to help each other. 我們理應(yīng)互相幫助。(要求)

　　You are supposed to hand in your papers before class is over. 希望你下課前交卷子。(期望)