buy的四点用法注意

1. 用作动词，表示“买”，可带双宾语；若双宾易位，通常要用介词 for。如：

我叔叔为我买了本英语词典。

正：My uncle bought me an English dictionary.

正：My uncle bought an English dictionary for me.

2. 表示向某人买某物，通常用介词 from。如：

He bought this watch from a friend. 他从一位朋友那儿买了这块手表。

3. 表示用多少钱买某物，通常用介词 for。如：

I bought the computer for $600. 我花600美元买了这台电脑。

He bought it for very little money. 他买它只花了一点点钱。

【注】有时也用介词 at, 侧重指价格。如(from www.yywords.com)：

He bought them for [at] 10p each. 他以每个10 便士的价格买下了它们。

4. 是终止性动词，因此在肯定句中不宜与一段时间连用。如：

这房子我已买了十年。

正：I bought this house ten years ago.

正：I have had this house for ten years.

正：It’s ten years since I bought this house.

误：I have bought this house for ten years.