Final answer:
In the sentence 'While the snow fell, Hope sled down the hill,' the word 'While' is the subordinate conjunction that joins the subordinate clause to the main clause.
Step-by-step explanation:
The sentence provided by the student is 'While the snow fell, Hope sled down the hill.' In this sentence, the word 'While' is the subordinate conjunction.
Subordinate conjunctions are used to join a subordinate clause to the main clause, and they often show a relationship of time, cause, or condition. The subordinate clause 'while the snow fell' cannot stand alone as a sentence and it provides additional information to the main clause of the sentence, which is 'Hope sled down the hill.'
The subordinate conjunction in the sentence is while. A subordinate conjunction is a word that connects two clauses, with one clause being dependent on the other.