Usages of kèshàng
老师 在 课上 解释 了 问题 的 原因， 也 说 清楚 了 可能 的 结果。lǎoshī zài kèshàng jiěshì le wèntí de yuányīn, yě shuō qīngchu le kěnéng de jiéguǒ.
In class the teacher explained the cause of the problem and also clearly stated the possible result.
在 课上， 老师 常常 让 我们 用 中文 问 问题。zài kèshàng, lǎoshī chángcháng ràng wǒmen yòng zhōngwén wèn wèntí.
In class, the teacher often has us ask questions in Chinese.
Elon.io is an online learning platform
We have an entire course teaching Chinese grammar and vocabulary.