我学习没他刻苦。

I don't study as hard as he does.

《新英汉大辞典》

高一那年，我曾经有过一段刻苦学习英语的艰难时期。

I had a really tough time learning English in the first year of high school.

youdao

从很早起我就只是期望她们在学校里刻苦学习，希望他们取得成功。

From early on I just expected them to work hard at school, to want to achieve.

youdao

I've been noticing you study hard.

我一直都发现你学习很刻苦。

I've been 课堂 - SpeakingMax英语口语达人