但是有些班级表演的不是很好的翻译：But some class performances are not good 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

But some classes are not performing well

But some class performances are not good

But some classes and gradees perform are not very good

But there are some classes of performance is not very good

But some class performances are not good