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Ye Pyar Nahi to Phir Kya Hai is an Indian romantic drama television show which airs on Sony Entertainment Channel replacing the earlier drama show Haasil.

http://hindistopi.com/yeh-pyaar-nahi-toh-kya-hai/?e=932193&h=knilelgnisdhenpayal

Which rule for the use of indefinite article is used here?

Why can't we use the definite article here?

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JigneshbharatiWhich rule for the use of indefinite article is used here?

The "subset" rule. Or the "definition" rule. Or the "example" rule.

X is a Y.

A dog is an animal. — Dogs are a subset of animals. To define "dog" you can start by saying it's an animal. A dog is an example of an animal.

Others:

A diamond is a gem.
Gone with the Wind is an old movie.
War and Peace is a book.
A cardiologist is a doctor.
A whale is a mammal.
JigneshbharatiWhy can't we use the definite article here?

There's nothing definite about it. If we say, for example, "A cardiologist is the doctor", which doctor are we talking about? A doctor who works in Japan? A doctor who has black hair? A doctor who is not married?

No. We're not talking about any of those things. The idea is that if someone is a cardiologist, they are by definition also a doctor, not any specific doctor, and thus not "the doctor".

CJ