How are you doing with your English studies?
How are you coming along in your study of English?
How are you doing in English?
How are your Englishstudies going?
I'm sure other people will have other variations, but generally "you" are doing, and your studies are going.
So, did you find the house in which the American teachers are teaching?
I just saw her once. (This is my preference, but if you want to be very emphatic, you can say "I saw her only one time!")
[not a teacher]