1、三的英语写法是：three，英语读音为：英 [θriː]、美 [θriː]。

2、复数： threes。

3、例句The way I see it, you have three main problems. 意思是：我认为你有三个主要问题。There were only three of us on the advanced course. 意思是：只有我们三人学高级课程。