In which sentence does the verb agree with the subject?
a. either my cousins or my sister are going to plant the seeds.
b. either a deer or a rabbit have eaten vegetables from the garden.
c. both daffodils and tulips are blooming in the garden.

In the sentences given, the sentence in which the verb agrees with the subject is letter C: Both daffodils and tulips are blooming in the garden. Letter A and B uses ‘Either..or” which means it could be one of them that agreed while the other is not agreeing. 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.