Question

In paragraph 3 of Swimming Strokes by Lee Carroll, I found 3 errors in subject-verb agreement and 3 errors in parallelism. Are these answers correct because all the errors in the passage range from 0 errors to 3 errors and nothing higher than 3 errors in each paragraph?
SraJMcGin
If we do not see that paragraph, how can we tell?

Sra
нмйш