我爸爸的学生很喜欢上他的课 用英语怎么说

这句话有很多种翻译方式，以下是比较成熟的几种：
1、The students of my father favor his lessons that much.
2、My dad's students are fond of the classes he teaches.
3、My dad's lessons are liked very much by the students of him.
4、The students of my father enjoy having his classes so much.

针对楼主的第二个问题：
1、class可以指班级，级别，上课的行为。作上课行为时通常指整个课堂，包括老师讲授和学生听讲。比如数学课、英语课、物理课等。
2、lesson通常是指上课的内容或者课文本身，范围非常小，比如最常见的lesson one。除此之外，lesson还可以指教训的意思。
综上，这里句子里面的课比较宽泛，所以用class为宜。

希望能够帮到你，呵呵……

My father's students like having his classes very much.

My dad's students enjoyed his classes

the students of my father's like having his classes very much

The student who learn from my father likeS to have his class !

My dad's students enjoyed his classes.