Perfectivity
动词的完成式
🗣️ 情景例句
He was ill at ease with people whom he didn't understand.
他和不熟悉的人在一起感到不自在。
It should be there at 11:45, but it may be a little late.
应该是11点45分到那里，但也可能稍晚一点。
Who's this?
这是谁？