must have meaning in Chinese
非有不可
Examples
- Oh, it must have been that other chap .
啊，很可能是另外一个小伙子。 - It must have been a valuable experience .
那准是有价值的所见所闻了。 - I must have been a trial to them too .
我那时也一定是他们的一块病。 - The theft must have been an inside job .
这一窃案一定是内部人干的。 - What a blank, dreary mind he must have !
他的思想一定是多么空虚乏味！