When an adverb modifies a verb with a verb, the adverb should generally be placed
a. at the beginning of the sentence.
b. before the verb.
c. at the end of the sentence.
d. after the verb.

When an adverb modifies a verb with a helping verb, the adverb should generally be placed letter D: after the helping verb.  

Verbs are simply known as the ‘action’ words – may it be mental, physical or mechanical. When verbs are paired with auxiliaries (helping verbs), they are known as verb phrase. These helping verbs always go first before the actual verb.

Adverbs, on the other hand, are words used in adding meaning of a verb, clause, adjective, or another adverb. They can be used if: firstly, a sentence contains a subject and a predicate. Secondly, when a subordinate conjunction is used and thirdly, if it answer the ‘adverbial questions’ – when, why, when and how. It is also further categorized to time, place, manner, degree, condition, concession and reason.