I would like to make a response to this question,
There are no adjectives in the sentence: "Sierra runs down the hill," as nothing describes either variables in the sentence, the structure of the sentence is acceptable. Just a quick definition: Adjective; something describing a noun.
None except the definite article, 'the'.
If you mean "Is the following sentence a declarative, interrogative, or exclamatory sentence, 'He huffed and he puffed and he blew the house down!' ?" Then it would be an exclamatory sentence.
The plane came down later tha expected. In this sentence, what part of speech is the word DOWN
It seems the syntax or grammar system broke down in the sentence.
The word down is a noun in that sentence.
-An adjective describes something...ie: the man walked down the street...has no adjectives. The ugly man walked down the street...."ugly" is the adjective. Adjectives are not needed in a sentence...they only help to describe something better.
What is the adjective in the following sentence? The car moved very slowly down the street, stopping at every light.
The verb is walking.
The preposition is "down." The phrase "down the banister" modifies the verb slid.
Down he lay
The verb is sped :)
She walked backward down the hallway to see if anyone was following her.