Hi Ahmedali, Nothing in English is "always" and "universal," it seems, and the biggest confusion with a and the seems to be when you have nouns that are usually uncountable being used in a countable way. If you can think of a way that there could be more than one of something, or more than one type of it, then try using a. I think this may be something that you have to get a feel for over time.
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CalifJimIt seems that the shorter the word, the longer it takes to master it!How true! To my mind, the articles are the most difficult aspect of English grammar owing to the myriad illogicalities in their use.
CJ
01cite10CalifJim12cite11i10A cobra is a snake.12i12blockquote10To me that sounds as though it were written by a child. It would imply that some cobras are not snakes.0-