Question

fix any errors with subject - verb agreement below. click \submit answer\ if there are none.
the suspect, not perry the platypus, were at the scene of the crime.

Explanation:

The subject of the sentence is "the suspect", a singular noun. The phrase "not Perry the Platypus" is an interrupting phrase that does not change the singular subject. Thus, the verb must be the singular "was" to match the singular subject, correcting the subject-verb agreement error.

Answer:

The suspect, not Perry the Platypus, was at the scene of the crime.