    Sentence 1: I have a R: B1/B2 US visa  for 10 years. Can I visit the United  States for. tourism only? Should it be  combined with business?    Sentence 2:1 was visiting the US on  @ B1/B2-visa valid’for 5 years and I  decided'to study there so I converted  to the Fi'status. I left the US after  completion and my [20 was  terminated. Can I still visit the US  again on my B1/B2 visa which is still  valid?