Answer:
The adverbial clause is "when they went there" and the verb it modifies is "would find", with 'would' being the auxiliary or helping verb.
Step-by-step explanation:
Adverbial clauses are groups of words that function as an adverb in a sentence. They give an explanation or extra detail about the verb and are dependent clauses, meaning they cannot be used independently as a full sentence.
In the given sentence "when they went there, they would find work", the dependent clause and adverb clause is "when they went there". This clause also helps explain or provide more information for the main clause "they would find work".
Thus, the adverbial clause is "when they went there" and the verb it modifies is "would find", with 'would' being the auxiliary or helping verb.