20 Most Common Errors

A study of 20,000 student papers resulted in a list of the most common student errors including these below.

Easily fixable:
Missing comma after an introductory element: see handbook page 196
Vague pronoun reference: see handbook page 186

Sentence boundary issues:
Missing comma in a compound sentence: see handbook page 198
Comma splice: see handbook pages: 168-172
Sentence fragment: see handbook pages 168-172
Fused sentence: see handbook pages 168-172

For the full list: http://bcs.bedfordstmartins.com
Study citation: Connors, Robert J., and Andrea Lunsford. "Teachers' Rhetorical Comments on Student Papers." CCC 44 (1993): 200-23.