As long as the teacher is finished with the academics and pre-requisite requirements in teaching English as the Second Language or a graduate of a baccalaureate course having English as the major field of study in the academic years, then this non-native speaker of English has the capability on delivering English lessons to the students, especially the young learners to learn English as the Second Language.
Non-native English Teachers are equipped with sufficient knowledge and skills for these youngsters to learn English. During the time where these non-native teachers are still on the process of learning how to teach English, all the possible problems to arise were thoroughly discussed and evaluated. In fact, most of the resources and references used in learning the language and on how to impart it came and were written by prominent personalities like Avram Noah Chomsky, Zellig Harris and more are native English speakers and a language enthusiast themselves. Furthermore, other references, techniques and strategies on how to impart English as the Second Language which were then authored purely by English Speakers were adapted by these non-native English Teachers.
Today most non-native English speaking countries are hiring English Teachers for their young generation. This is an obvious phenomenon that English Language will be the international language to be used soon in transacting business or in a simple communication with another country.
But most of these non-native English speaking countries hire teachers from English speaking countries. Of course, it is logical that the best teacher will be the person who is very much inclined and a natural speaker of the language. Recently I have spoken to an Arabian National who, according to my understanding, he owns a school catering young Arab kids with ages ranging from 6 to 10 years old. He is hiring non-native English Teachers. That according to him, even though these teachers are non-native English, he is confident that they could handle and train these kids to learn English as their Second Language. And he told me that his teachers (non-native English Teachers) had proven a lot to him and to kids.
Teachers are trained to teach with their chosen field even if he/she is a non-native teacher of English. It true that a native English speaker will be a good teacher of the language, but this is through imitation purposes only. Unless of course it the teacher is a qualified teacher and graduated as an English teacher. The youngsters will surely imitate their teacher’s diction and articulation and so on, because these kids are in that stage of learning by imitation. Unless of course, if the teacher has the knowledge, techniques and strategies on how to impart the language is another thing. Whether it be a native English speaker or a non-native English speaker, as long as they both passed to a certain qualification and have the necessary requirement to teach English, both teachers knew how to make these kids learn English.
Though it is the prerogative of the non-native speaking countries School Administrators to hire teachers whom they see fit to teach English with their young generation, they should look beyond what a language teacher really is especially Language and English Teachers.