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法,需要從以下幾個(gè)方面來(lái)掌握。 (1)當(dāng)句子的主語(yǔ)是人時(shí), be supposed to 用來(lái)表示勸告、建 議、義務(wù)和責(zé)任等。如: You are supposed to ask our teacher if you want to leave the ,應(yīng)該先問(wèn)一問(wèn)我們的老師。 (2)當(dāng)句子的主語(yǔ)是物時(shí), be supposed to 用來(lái)表示某事物本 應(yīng)該發(fā)生而沒(méi)有發(fā)生。如: The meeting was supposed to take place on Tuesday, but we have to put it ,但我們不得不 把它推遲了。 (3)be supposed to 的否定形式為 be not supposed to do,意為 “不應(yīng)該做某事 ” ,表示命令和禁止。如: You are not supposed to talk