'''If your 'written grammar' is representative of your spoken language then I would not want you to have taught my kids, both of my children did go to International schools in non English speaking countries. Why should schools in Shenzhen have to accept less than schools, in say Europe, regarding the quality of English spoken (and written)......That said I also followed a heavily accented English guy 'who's students' "also couldn't" understand him who left the same problems.'''

Now,'who's students' or 'whose students',which one is correct?And "also couldn't" is better expressed as couldn't either,isn't it?

According to your logic,as you've outlined above,you haven't the right to teach English to your children,let alone to anyone else.That's because of your iffy 'written grammar'.People in glasshouses shouldn't throw stones.Judge not and ye shall not be judged.

I'm full up,so no spam please.Ta very much!