What’s wrong with this sentence?
“Those was the good old days.”
The quoted sentence has a subject-verb agreement error. The plural demonstrative
pronoun those does not agree with the singular verb was in
number.
To correct the sentence, change was to were.
Those were the good old days.
If you need help with subject-verb agreement, Focus on Grammar: Subject-Verb Agreement can help you with this topic. When you finish the book, spotting and correcting subject-verb agreement errors will be second nature to you.
