Title: Exercise 4 - Advanced Exercises on Grammar, Punctuation, and Usage
Course: Applied English for Science and Technology > Section: 2

Adapted from http://writing.eng.vt.edu/exercises/

Each of the following paragraphs has four mistakes in grammar, punctuation, or usage. Possible mistakes are as follows: run-on, fragment, subject-verb disagreement, wrong word, missing comma, undesired comma, colon error, unclear pronoun reference, and possessive error.