她在课堂上认真听讲用英语怎么说？

Her English by listening carefully in class?

She pays attention in class.
"listen carefully" 翻译的太生硬了，不建议你这样用。不过如果你刚开始学英文（初一初二学生），没学过pay attention这个短语，用“listen carefully”勉强可以用来应付你们的英语作业了。

She listen carefully in the class.

she listened carefully.