The following sentence has been split into four segments. Identify the segment that contains a grammatical error.

“Do you want to join us for lunch?” / “I'm sorry / my physics class will start at 1 p.m. / and don't finish till 3 p.m.”

Question

Question

This question was previously asked in

SSC CGL 2023 Tier-I Official Paper (Held On: 19 Jul 2023 Shift 1)

Answer 1

The erroneous part is: and don't finish till 3 p.m.

Key Points

According to the rules of sub-verb agreement, singular subjects take singular verbs and plural subjects take plural verbs.
The subject and verb must agree in number: both must be singular, or both must be plural.
In the question, the subject of the sentence "physics class" is actually singular (as it refers to one class), but the verb "don't" is a contraction of "do not," which is plural.
Hence, there is a mismatch in the subject-verb agreement. With a singular subject "physics class," the verb also has to be in its singular form.
The correct form would be "doesn't," the contraction of "does not."

So, the corrected sentence would be: "I'm sorry, my physics class will start at 1 p.m. and doesn't finish till 3 p.m."