Some people don't know when they're well off.

　　有些人身在福中不知福。

　　I don't know what to make of the new manager.

　　這位新經(jīng)理，我不知道怎么評價(jià)他才好。

　　You don't want to do it like that.

　　你不應(yīng)那樣做。