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

So very important that you stay committed to it.

因此，不断努力学习是很重要的。

学第二外语的时候 - 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

I studied hard.

我学习很努力。

I'm sure 实战 - SpeakingMax英语口语达人