Here in Australia we still have the volunteer tutors who go to houses, or teach in small groups in places like library study rooms. Sometimes a TAFE (like a technical college) will offer a short free course, such as 6 Saturday mornings for these tutors. I did one once, and it was excellent. It was assumed that many of the students would be older married women without a job - the sort of women who get little chance to interact with anyone outside of family.
We were taught that we had to teach them 'survival' skills first - how to get a bus and pay the fare, how to recognise the right stuff at a supermarket, how to greet people, basic standards of politeness etc. Then we built on that. We were taught that some would have no literacy in their own language, so basic reading skills were needed too.
AND we were taught that some folks just can't manage any of it, no matter how good the tutor, and how much they want to learn.