English his a compulsory subject for college students.

英语是大学生的必修课。

Liu Jian started learning English while in middle school at age 13. It was a compulsory subject, and he took classes in it every day.

刘健（音）从初中开始学英语，当时13岁。当时这是一门必修课，他每天都会上英语课。

English is a compulsory subject on this course; art is optional.

这个课程里,英语是必修科目, 美术是选修.