I'm tutoring a 9-year-old Korean girl in English. One of her biggest problems with English is using the definite/indefinite article. She often doesn't use one when she should. I'd appreciate some suggestions with how to help her with both conversational and written English.
I've taught Asian children this. Try telling her this: a means 1, any one. The means "a certain special one, you know which one, and I know which one."