你总是掐着他开始上课的时间。

You count such a watch by the time he starts his class.

youdao

我帮上星期缺席的人打印了些上课的要点。

I have typed out some lecture notes for the benefit of those people who were absent last week.

《牛津词典》

是可以在家上课的。

It is possible to take classes at home.

youdao

This is sort of venues for learning: recitation, reading, homework, so, that's my responsibility, the lecture. Recitation: that's got to be the staff.

这些是学习的内容：,背诵课，阅读，家庭作业，这是我的职责，上课，背诵课：,那则是由教学人员负责。

麻省理工公开课 - 固态化学导论课程节选

And then I've started taking lessons at a small academy just a couple of streets away from my house.

然后我开始在离我家几条街的一家小型学院上课。

I've been 实战 - SpeakingMax英语口语达人

So, this is what happens. You go to the website, there's all these bars down the side, so there's lecture videos.

事情就是这样，你们访问这个网站，在下边有这些栏，还有上课的视频。

麻省理工公开课 - 固态化学导论课程节选