Revelle Humanities Grammar Handbook
6 Sentence fragments
7 Run-on sentences
8 Verb agreement
13 Passive voice
15 ESL
17 Misplaced modifiers
18 Pronoun reference
20a Comparisons
21 Parallel construction
23 Commas
23d Sexist language
25/6 Semicolons & colons
29 Ellipsis
31 Brackets
35 Apostrophes
36 Abbreviations
37 Underlining
39 Numbers
41b Slang
41e Jargon
41f Pretentious language
42c Idioms
42e Clichés
43a Fluff

20a Incomplete Comparisons
When making a comparison between two or more items, make sure that you are clear on what you are comparing.

Incomplete comparison: When it came to trickery, Penelope was indeed craftier.

Revised sample: When it came to trickery, Penelope was indeed craftier than the suitors.