A feeling that some sounds or arrays of sounds belong to English while others do not.

A feeling that some words go together while others do not.

A feeling for the word classes of the language, the parts of speech.

A feeling that certain sentences are structurally related to others while others are not.

A feeling for structural differtences.

A feeling that some sentences have more than one meaning.

It is symbolic

It is a system

It is universal

It is creative

It is ambiguous