This might give you some ideas. I know the demand in china is or was very high, it was a guy I know in shanghai that I used to work with who told me about it. I do remember he said the chinese school teachers aren't all that good because they teach english but with chinese pronounciation and they make all kinds of mistakes... so everyone wants their kid to learn from a native english speaker, especially US english. Of course if you can speak some chinese or other asian language then you have a big advantage too, sadly I don't!
So you’ve decided to teach English online to Chinese students – by the way, it’s a great idea: the demand is sky-high! But you don’t want to start on your own, and you are not sure which company is…
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This is the idea, you do it over the internet and teach the kids how to pronounce words, what things mean, the usual stuff. I think especially working with young kids it's probably not very difficult academically, but you might have to be up at 1 AM when it's afternoon in shenzhen or wherever! I never looked into it seriously because I was too busy working in computing. I don't know what kind of money you can make doing this, it might not be a great deal, unless you put a lot of hours in or something. The nice thing about it is you can do it from home just with a laptop. Anyway, it crossed my mind as something you might be able to look into while you look after your wife etc. I don't have any direct experience of doing this though, that's about as much as I know!