Identify the part of the sentence that contains a grammatical error.
A. The movie, B. which you recommended, C. was both interesting D. and entertain.
Show answer & explanation
Correct answer: D
Explanation
The sentence requires parallel structure after the phrase "was both". "Interesting" is an adjective, but "entertain" is a verb. To make the sentence grammatically correct, "entertain" should be changed to the adjective form "entertaining".