该句表示"按道理讲应该......"，可用来表达猜想或命令（相当于should）等含义。 1. He is supposed to arrive on the 5 o'clock train. 他应该乘五点的火车到达。 2. Summer is supposed to come during May. 夏天应该在五月来临。 3. It was supposed to be ready last week. 这件事上星期就该做好的。 A: Hey, how was the show? 嗨，那场演出怎么样？ B: Not great. It's a kind of boring. 不怎么样。有点乏味。 A: Really? I heard it was supposed to be great. 是吗？我听说它应该很棒的。 B: Yes, me too. But I'm disappointed. 我也这么听说。但我很失望
