Yes. I had two students who spoke basic level English but
grammar was good. I was very appreciative of my advanced students.
I had five who had spent time in the US so I could joke with them.
They were so advanced, I taught them more slang than anything.
My other two advanced
students majored in English at a Japanese University. I would print
out a news article and we'd dissect it for an hour, something which
I really enjoyed.