✔ Correct Answer: D. He is a good teacher, but his classes are boring sometimes.

The correct answer to the question “Choose the sentence with the incorrect use of the coordinate clause. She is a great singer, but she is also a great dancer.” is He is a good teacher, but his classes are boring sometimes.. This question belongs to Grammar Concepts & Terms in English. Practice the related questions below to master this topic for your FPSC, PPSC and NTS tests.