我无法像从前那样专心的上课的翻译：I can't concentrate as before class 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

I can not concentrate on school as usual,

I can't concentrate as before class

I was unable likely formerly such wholly absorbed attending class

I am unable to concentrate on their classes as formerly,

I can't concentrate as before class