"buy"后面接双宾语的例句如下：

1. My mother bought me a guitar.

2. I bought him a magazine yesterday.

3. Try the shoes on before you buy them.

4. We buy our fruit and vegetables at the market.

在这些例句中，"buy"后面都接了双宾语，即直接宾语和间接宾语。直接宾语通常是指物，而间接宾语通常是指人。在间接宾语之前，我们常常使用介词"for"来连接，例如："buy sth. for sb."。这种结构表示“为某人买某物”。