It is difficult to learn English.
Study表示比较深入的学习和研究，很专业的。
Learn表示初步学习，不是很深入的研究。
我下边有几个，不妨看看：
It is not an easy job to learn English.
You may have much trouble in learning English.
It is a troublesome thing to learn English
It is very difficult to study English!
English learning is quite troublesome.
Or learnig English is quite troublesome.
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