仙呢榕儿
他们在上课。意思是他们正在上课，所以说这是一个现在进行时。用英语说就是They are having classes.因为不是一个人，所以说可能是上的科目也不同，所以用复数形式。
笨笨猫Shirley
who was Sir Charles'younger brotner.Roger was a criminal who escaped from prison and ran away to South America.Everyone thought he had died unmarried
in class,是在上课期间，after class 是课后，take class,表示上课，如：我现在正在上英语课，I am taking class in english.
英文原文： in class 英式音标： [ɪn] [klɑːs] 美式音标： [ɪn] [klæs]
上课的英文单词是attend class、go to class 、have a class 、class begins、beginning a class、Let's begin our class、give a lesson等。
例句：
the class is with a lesson
首先要看是什么课。 喜欢的课认真的听。积极的思考。
I like to have lessons with my students
teacher is teaching. teacher is taking the lessons.
你不应该在上课的时候讲话 You should not talk in class time
胖纸没烦恼
他正在上课. He is in class注：class 英 [klɑ:s] 美 [klæs] n. 班; 阶级; 等级; 种类; vt. 把…归入某等级，把…看作（或分类、归类）; 把…编入某一班级; adj. 很好的，优秀的，出色的; [例句]He acquired a law degree by taking classes at night.他通过读夜校获得了法律学位。
