Our foreign teacher speaks Chinese very fluently as if he were Chinese.

我们的外籍老师汉语说得很流利，好像他是中国人一样。

Who needs a foreign teacher?

谁需要外教？

Then I asked my foreign teacher about it.

然后我向我的外国老师询问它。

He is a foreign teacher of Irish stock.

他是一个爱尔兰血统的外籍教师。