both are ok learn means to study or practise something so that you know more about it or know how to do it: she is learning to drive. she is learning about the french revolution. study means to learn about something by reading books and going to classes at school, college etc: she is studying english at london uiversity. i study for two hours each night.

Studying. Because learning is what you get by studying.

Personally, I like "I've been studying English for 5 years". When you study something you typically already learned it once and you are trying to memorize it at this point. When you learn something, you don't know it at all and are taking steps to understand it. For your second part, I think both work depending on your situation. If you don't know anything about English, I would say "I'm learning English". If you are trying to memorize English words, I would say "I'm studying English". I could be wrong though :o

In your example sentences, "learn" is British English and "study" is American. The meanings are exactly the same, just different speaking habits. The answerer above is from Australia so "learn" sounds more natural to her, but as an American it sounds weird to me! ;)

I've been learning English for 5 years, sounds more natural.