I'd love to, but I must study for the test.

我很想去，但是我必须学习准备考试。

youdao

But I must study well now, because competed too has been intense, I not diligently, could be defeated!

但是现在我必须好好学习，因为竞争太激烈了，我不努力，就会失败！

youdao

I think having a journey in Yunnan will be so interesting, but it's just a beautiful dream now and I must study hard for the dream.

我想在云南旅游将非常有趣，但是现在它只是一个美丽的梦想而已，我必须为了这个梦想而努力学习。

youdao