Question on: SS1 English - Noun phrase : Functions in a sentence

The noun phrase in the sentence "The big red ball rolled down the hill" is "the big red ball." This noun phrase is the subject of the sentence. The subject is the person or thing that performs the action of the verb. In this sentence, the noun phrase "the big red ball" is performing the action of rolling. The function of the noun phrase in the sentence "The big red ball rolled down the hill" is to tell us what rolled down the hill. The noun phrase "the big red ball" provides us with more information about the ball, which helps us to understand the sentence better.