One to one foreign teachers have an important influence on children's English learning. Let's share the classification of one to one foreign teachers:
Class I: professional language teachers with TESOL / TEFL certificate and rich teaching experience from English-speaking countries such as UK, USA and Canada, etc. are relatively expensive.
Class II: from English-speaking countries, with TESOL / TEFL certificate, but not full-time language teachers or teachers specialized in teaching children's language.
The third category: from English-speaking countries, no qualification. Some of them are international students, even tourists, who come to take one or two classes temporarily, so they have great mobility.
The fourth category: from non-native English speaking countries, it is inevitable to have "local characteristics" of English. Such foreign teachers are not uncommon.