It's supposed to... 应该……
用法透视
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。
支持范例
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。
会话记忆
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。