OnLine English proofreading and editorial service - Learners' resources

Use fewer with plural nouns; for example, 'There are fewer people here than there were yesterday', not 'There are less people here than there were yesterday'. Use less with uncountable nouns (that is, ones with no plural form); for example, 'He has less money than I have'.

Learners' resources - English grammar and writing

Common Errors in English
Paul Brians, Professor of English, Washington State University, USA

Guide to Grammar and Writing
Professor Charles Darling, Capital Community-Technical College, Hartford, Connecticut

HyperGrammar
Writing Centre, University of Ottawa, Canada

OWL (On-line Writing Lab) Handouts
The Purdue University Writing Lab.

Great Books Online
Bartleby.com

The Internet Grammar of English
University College, London, UK

World Wide Words
Michael Quinion