Are there any simple rules for choosing the definite vs. indefinite (vs. none) article?

http://english.stackexchange.com/questions/2031/are-there-any-simple-rules-for-choosing-the-definite-vs-indefinite-vs-none-a


這答案幾好:

Well, if you insist on the rule being simple, here you are:

a = some, any
the = this, that

Don't put an (= any) article before a (= any) noun if the (= that) noun is preceded by:

a number
a possessive adjective ("my", "his", "our"...)
a "no", "some" or "any"
a "this", "that", "these" or "those"