他一直努力学习。

He keeps studying hard.

youdao

自上学期以来，贝蒂一直努力学习。

Betty has worked hard since last term.

youdao

他一直努力学习，所以他在很多方面都进步很快。

He studies hard all the time, so he has made rapid progress in many ways.

youdao

I've been studying really hard, but I just don't get it.

我一直很努力地学习，但总是学不好。

I'm worried 实战 - SpeakingMax英语口语达人

and she had really been struggling with it.

她真的一直很努力地在学习。

和钢琴老师 - SpeakingMax英语口语达人