Type in "grammar help" on Google, and you'll find over 36,000 sites. Some of these sites are wonderful, and others are a waste of your time. These are worth checking out.

General Grammar Help

Ask Dr. Grammar
Send questions to a free online grammar clinic, provided by Churchill House.

Authors on the Internet
An annotated list of links to sites on grammar and style

Daily Grammar
Get a free daily grammar lesson five days a week from Word Place, Inc.

Garbl's Writing Resources
Named one of the "101 Best Web Sites for Writers" by Writer's Digest

Guide to Grammar & Writing
Dr. Charles Darling's site includes help with everything from definitions to writer's block.

The Modern English Grammar HyperTextBook
Dr. Daniel Keyes' thorough guide to grammar and usage can be easily searched.

Guides to English Usage
Bartleby.com claims its collection of usage guides is "the best full-text searchable resource on the web."

Help for English Language Learners

Dave's ESL Cafe
Dave Sperling describes his site as "the Internet's meeting place for ESL/EFL students and teachers from around the world." Resources include a chat room, FAQs, quizzes, and a Help Center.

English as a Second Language (ESL) Resources, Handouts, and Exercises
Purdue's Online Writing Laboratory offers an extensive collection of material on grammar, idioms, and writing style.

English for Non-Native Speakers (ESL)
Recommendations from the University of Chicago's Writing Program direct you to text-based references or interactive quizzes.

ESL Slang Page
Look up a term from Dave Sperling's list or test yourself with a randomly-generated slang phrase.

Idiom Page
Find out what a specific idiom means or test yourself with a randomly-generated idiomatic expression.

Interesting Things for ESL Students
Check out the ESL Reading Room to find a Miranda Warning Jigsaw Puzzle and other unique ways to play with English.

Learning English: Words in the News
Read news stories from the BBC and listen to difficult words.

Printable Charts and Tables
Evelyn Farbman provides quick guides to troublesome topics like verbs and prepositions.

Randall's ESL Cyber Listening Lab
Listen to RealAudio files of English conversations, provided by teacher Randall S. Davis. The FAQs explain how to use and troubleshoot audio files.

Ruth's Help Pages: Language Help
A collection of useful resources on everything from pronunciation to grammar resources from Finnish teacher Ruth Vilmi.

Revision

Editing and Proofreading Strategies
Purdue's Online Writing Lab (OWL) suggests ways to deal with sentence-level errors and structural problems.

Power Revision
Technical writing teacher Donald A. McMurrey shows how to fix everything from weak sentence beginnings to ideas that don't flow.

Revising Prose
Make your sentences clear and emphatic with eighteen tips from The Writing Center at Rensselaer Polytechnic Institute.

Revising Sentences for Variety and Clarity
Here's where learning about grammar pays off: you can use sentence structure to emphasize your most important ideas.

Sentences: Checking for Six Common Problems
Give your sentence structure a final review with Temple University's checklist.

More Handouts for Revising and Rewriting
The Internet Public Library has compiled a list of "A+" handouts from online writing labs.

Grammar Resources on the Web
Recommended links to everything from Schoolhouse Rock lyrics to classic style guides compiled by the University of Chicago's Writing Program.

Grammar and Usage for the Non-Expert
Tina Blue realizes that most people don't want to read long technical explanations of grammar; they just want answers to common questions.