He said I must have done something bad to deserve it.

　　他說我肯定是罪有應得。

　　Now, I hadn't told him these details, so he must have done some research on his own.

　　你看，我沒有告訴他這些細節，因此他一定是自己作了一些調查。

　　She must have done a lot of work on it.

　　她一定在這上面花了不少功夫。

　　Where you come from, you must have done something.

　　你從哪里來的，你一定做了什么事。

　　You must have done well to have achieved this success.

　　你取得了這樣的成就，一定干的錯。