Foundation
English
Conjunctions
Sentences
Tenses
Question
Choose the correct verb from the options given below:
Either you or Sam _____ mistaken.
do
is
are
have
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Solution
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In this sentence we would be understanding the agreement of verb with subject. In this case, the subject is in singular form, it is either one of the subject, thus the verb should also be in the singular form.

"Is" is a singular verb. It is the right option
"are" is a plural verbs. It is the wrong option
"have" is the root VERB and is generally used alongside the PRONOUNS I / You / We / Ye and They and PLURAL NOUNS. It is the wrong option
“do” is used when referring to more than one person or thing. It is also the wrong option.
Option B is correct.