Please, let me know the difference between a/an/one. I mean, I only use "one" when I'm talking about the quantity of something?
Example: I have a friend. / I have one friend.
They have one child. / They have a child.
There is a TV in my house. / There is one TV in my house.
Are both of them right? Is there any difference?
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They are all right, but using 'one' you are stressing the number of items, while using 'a/an' you are indicating the existence of any.