Resources for grammar
Grammar should be correct and not clunky. The writing should have a light, readable touch.
*
Online grammar resources: Help for helping yourself
Proofreading tips from the New York Times
Center For Writing Studies: Active Voice
Purdue OWL: Subject/Verb Agreement (Pay particular attention to Guideline 10)
Grammar Girl: Subject-verb agrement
Center for Writing Studies: Dangling Modifiers
Grammar Girld: Dangling Participles
GrammarBook: Who vs. that vs. which
Center for Writing Studies: Fused sentences, run-ons and comma splices