她一直很努力英文

she always studies very hard.

He is always hardworking.或者 He always works hard.

He always works hard.

直译： The diligent girl always studies hard 意译： The diligent girl is always busy studying

She has been studying English hard.

直译：This diligent girl is always working hard （with her lessons).study hard 这种说法不很地道，有点中式英文的味道，也许大家都这么说，已经觉得是地道的英文了，但在国外没人这么说。这里的 diligent 和 working hard 意思上有些重复，一般来讲，这种重复不必要。这个句子完全可以写成：This hard-working girl is always making extra effort with her lessons. 这是说本来很勤奋了，但仍然付出更多的努力去学习。

The girl who is diligent always study hard。 晚安，好梦。