Buy 和 purchase 之间的区别是一个有趣的话题，因为许多人会说它们的意思相同。比如你是从市场上买手机是 buy 还是 purchase 呢？这是一个没有多少人能够回答的难题，而且再加上 get，那么如何合理地”买“呢？
1. 作动词，是普通用词，既可指日常随意购物也可指购买大件物品，可后接双宾语，意为”买，购买“，例如：
I bought some saris from the sale.
我在拍卖会上买了一些纱丽。
I should buy some meat for dinner.
我应该买些肉当晚餐。
He bought me a new coat.
他给我买了一件新外套。
I offered to buy him lunch.He bought a new coat for me.Customers may be buying mobile phones for their children.
2. 作名词，意为”合算的商品，买进（或出售）的东西，购买“，常用于搭配 a good/bad buy，例如：
This jacket is a really good buy, at ¥200.
这件夹克200元，很合算。
The shares look undervalued and are a good buy.This car was a real buy for $4000.
Purchase 词义同 buy，但更为正式，它是有合同协议的买卖，如买房地产，一个公司向另外一个公司下订单等。Have you purchased car insurance?She has purchased a villa [ˈvɪlə] in Shanghai.Except under clearly defined circumstances, it is illegal in Britain for a company to purchase its own shares.除非有明确规定的情况，否则在英国，公司购买自己的股份是非法的。How do you wish to pay for your purchases?A house is the most expensive purchase that most people ever make.No purchase is necessary for you to enter this competition.
Get 作动词，作”买，购买“义解时较口语化，可与 buy 换用，例如：Where did you get/buy that dress?My mummy got/bought me a pair of new shoes.I managed to get all three suitcases for under $200.
