表哥（biao ge）是指姑父的兄弟，在英语中可以称作"uncle by marriage"，这个短语的来源是由于表哥是通过和姑妈结婚而与自己的家庭联系在一起的。下面是一些例句：

My uncle by marriage is a very kind and generous man.

（我表哥非常善良和慷慨。）

I don't see my uncle by marriage very often, but when I do, we always have a great time.

（我不是很常见到表哥，但当我见到他时，我们总是玩得很开心。）

My uncle by marriage is a successful businessman, and he's always been a great role model for me.

（我表哥是一个成功的商人，他一直是我的楷模。）