How do verb tenses function in sentences?
a. they clarify when an action occurs.
b. they explain who is doing the action.
c. they consist of nouns.
d. they consist of adverbs. user: building blocks around for hundreds of years.
which of the following verbs correctly fills in the blank?
a. has
b. have
c. have been
d. is being

Verb tenses clarify when an action occurs.  

Building blocks have been around for hundreds of years.  

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. Perfect tenses serves a portraying the verb or the action word as something that already happened or is completed, thus the term ‘perfect’. If it is present perfect tense, it means that the action was already done relatively to the present (has/have with past participle). If it is past perfect tense, action is already finished relatively to the past (had with past participle and if it is future perfect tense, action is complete relatively to the future (will have with past participle