The compound sentence below is incorrect because the verbs used are in different tense. Is this a "subject-verb agreement error", "parallelism error" or other?
It was his duty; therefore, he has to fix the problem.
I took a grammar exam where I was expected to identify a "verb-tense agreement" mistake in a sentence. The sentence structure presented in the exam was exactly as the one I provided in the example.
The professor said that the mistake found in the sentence was a "verb-tense agreement". Therefore, I loss the points for that question.
Being a professor, I thought he was right, but after your and everybody else's reply to my question, I realized that my answer was correct.
Thanks for the input.