Final answer:
The adverb in the sentence "He is often wandering the streets" is 'often'.
Step-by-step explanation:
The adverb in the sentence "He is often wandering the streets" is often. An adverb is a word that modifies or describes a verb, an adjective, or another adverb. In this case, the adverb "often" modifies the verb "wandering," giving information about the frequency of the action.
Learn more about Adverbs