上课认真听讲英语Listen carefully in class；
carefully ：adv.仔细地；小心翼翼的；
in class：在上课；在上课中
（图片来自网络侵删）
There is lots of reading in class.
课上要进行大量的阅读。
He was unruly in class and made an enemy of most of his teachers.
他因上课调皮捣蛋而成为大多数老师的眼中钉。
Parents always want their children to get more individual attention in class.
家长们总是希望自己的孩子在班上能得到更多的个别关注。
