There is no such thing as a free lunchexprexpression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own."
(Everything has a cost)
天下没有免费的午餐 tiān xià méi yǒu miǎn fèi de wǔ cān
I had to pay taxes on the free gift. Well, there's no such thing as a free lunch.