I have been studying at home since the graduation. Before that, I were always studying at school.
I used to study at school, after graduation, I have been studying at home.
我学过的:I used to study at school when I was a student, but now I'm studying at home.
I have been studying at school before graduation ，after that,Ibegan to study at home.
I had been studying at school. After that ,I've been studying at home.
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