Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
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Answer:
1) Ours is the last house on the street.
2) A
3) A
4) Is she really going out with that guy?
Explanation:
1 and 2) Adjectives are words that modify nouns. An adjective describes an action.
3) Dog modifies angry because it's the dog that is angry.
4) A prepositional phrase is a group of words consisting of a preposition, its object, and any words that modify the object.
HOPE THIS HELPS!! <333
-Silver