Quoting: Wroclaw
Are you trying to say that those involved in conversation are not real teachers. If someone taking a conversation class can't explain grammar then they shouldn't be in the classroom.
Example: What happens when a student asks.........Why did you use Past Simple and not Present Perfect ?
The student needs an answer there and then.
Yes, the native speaker who teaches conversation is not necessarily a qualified teacher.
The whole idea is that the students get used to a proper English accent and will learn to become comfortable when conversing in English. These students have separate grammar lessons which are being taught by a qualified (Polish) English teacher.
Conversation lessons with the native speaker are an extra service the language school is providing.
As I said, there is always a qualified teacher in the classroom during the conversation lessons so when the native speaker has difficulty explaining some grammar rules (most of the time the native speaker is able to deal with these issues) then the qualified teacher is there to back up. It's as simple as that.