用英语学英语：怎么理解on the house是“免费”的意思？
1) 相信很多学过英语口语表达：It's on me=I'll pay for you=I'll foot the bill的人都知道这里的 on有pay the money的意思，类似中文“包在。。。身上”的“上”字。
2) 相信很多学过英语口语表达：The house always wins(玩不过庄家的，庄总是赢家，买的没有卖的精)。你就会知道这里的the house=the management=the establishment有了这两句对on和house理解的“垫底”，on the house中对on和house的意思就不难理解了(但是，估计看短语on the house还是不排除有其“本义”“在房顶上”的含义的，要看出现的上下文)。
3) 我们还是“问问”英英字典吧，Put English into English
on the house：
1. as a gift from the management, free
2. Paid for by the merchant or the establishment or the management
3.[of something] given away free by a merchant
4. At the expense of the establishment
5. (of drinks or a meal in a bar or restaurant) free(of charge)
正是因为我们Put English into English，用英语学英语，我们才可以把学过的英语as a gift from the management啦, free啦，Paid for by the merchant or the establishment or the management啦， given away free 啦，At the expense啦(多漂亮的短语！) ，free(of charge)啦“用”起来，同时用它们表达on the house
4) Put English into English英语口语训练
1. Okay.Got you.Just like：It's on me and The house always wins, On means Paud by,House means the management
2. So,On the house means your food or drinks are paid for by,at the expense of the management.It means It's free!
For example,you may say：
3. Tonight the drinks are on the house.
4. Please accept this bottle of wine on the house as an apology.
5. Don't worry, this round is on the house.
6. I went to a restaurant last night. I was the ten thousandth customer, so my dinner was on the house.
当你的英语学习终于能做到“见英语，想到的还是英语”，而不是望文生义的中文时，你不仅学会是在“学”几句实用英语口语，更重要的是你的英语正在踏踏实实的进步。
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