Select the most appropriate option to substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
The pilot along with his crew have gone on vacation for a month.

Correct option is C

The correct option to substitute the highlighted segment in the sentence "The pilot along with his crew have gone on vacation for a month." is option (c) has gone on.
· The subject of the sentence is "The pilot," which is singular. The phrase "along with his crew" is an additional phrase and does not affect the number (singular or plural) of the subject. Therefore, the verb should agree with the singular subject "pilot," which requires the singular verb "has" instead of the plural "have."
Grammatical Rule Involved:
· Subject-Verb Agreement: The verb must agree in number with the subject. When the subject is singular, the verb must also be singular, regardless of any additional information in the sentence.
· Example:
· Correct: "The teacher, along with her students, has gone on a field trip."
· Incorrect: "The teacher, along with her students, have gone on a field trip."