
Melissa K. answered 02/05/22
Medical Student Knowledgeable in Diverse Topics
A general rule is that adverbs can sometimes be identified with the ending -ly, though this is not always the case. The function of the adverb is to modify or qualify an adjective, verb, or other adverb.
In the above statement, "Extremely" is the adverb that qualifies the adjective "difficult." The second adverb is "carefully" which qualifies the verb "reaching." The third adverb is "not" which modifies the verb "see."