Twenty years ago, Mr Li was a teacher. He taught Chinese. Chen Hai was in his class.He was a good pupil. He studied very hard.

二十年前，李先生是一位老师。他教语文。陈海在他的班里。他是一名好学生。他学习非常努力。

Now Mr Li doesn't work. He's learning English. Chen Hai is an English teacher. He's teaching Mr Li.

现在李先生不工作了。他正在学习英语。陈海是一位英语老师。他正在教李先生。