It is true that the grasp of English that some FT's have is a bit iffy when English is not truly their first language, irrespective of colour; however, if you maintain you have a foreign English teacher(first language not English or not standard English) on your books and you place him/her in say a middle school alongside or instead of an Englishman, American, Australian whatever, then you should be obliged to pay him the going rate. Yuncheng IELTS has a shameful attitude towards its African teachers.