Check out these web sites, you’ll find them very useful!
A. Dictionaries Online
1. Merriam-Webster
Online dictionary with good examples
(http://www.m-w.com/home.htm)
2. Cambridge Dictionaries
Online Dictionary with good examples
All definitions are from “The Cambridge International Dictionary of English”
(http://dictionary.cambridge.org)
3. Chinese-English Dictionary of Modern Usage
Lin Yutang's Chinese-English Dictionary of Modern Usage (Online Version)
林語堂《當代漢英詞典網絡版》
Online Dictionary with good examples
By The Chinese University Press
(http://humanum.arts.cuhk.edu.hk/Lexis/Lindict/)
3. The American Heritage Dictionary of the English Language
Online Dictionary with good examples
(Over 90,000 entries feature 10,000 new words and senses, 70,000
audio word pronunciations, language notes and word-root appendixes.)
(http://www.bartleby.com/61/)
4. Babylon
Online English Dictionaries & Glossaries
There are huge database of glossaries, covers a wide range of professional and interest field, including Medicine, Business, Sports, Computers, Electronics, Education, etc.
(http://www.babylon.com/gloss/glossaries.html)
B. Grammar
1. Grammar Central CLTA
Online Grammar notes and short exercises
(http://www.clta.on.ca/hillsofmexico/gc/homgrammar.htm)
2. Free-English
Lots of interesting online grammar games! For junior students
(http://www.free-english.com)
3. Englishpage
A good grammar site with easy-to-understand notes
(http://www.englishpage.com)
4. ESL resource centre
A good grammar site for ESL students.
For both junior and senior students
(http://eslus.com/eslcenter.htm)
5. EduFind.com
English Online Grammar, with comprehensive grammar notes
(http://www.edufind.com/english/grammar/index.cfm)
C. Writing
1. MysteryNet.com
2. Story Book Online Network
Creative Writing, Book readings, Classic tales & Fun activities
A story telling community for children & parents
(http://www.storybookonline.net)
3. The Poetry Zone
A very interesting web site for junior & senior form students
(http://www.poetryzone.ndirect.co.uk)
D. Conversation / Phonetic
1. Virtual Learning Centre
Some exercises on spoken English
A very useful web site for practising spoken English
(http://www.edict.com.hk/vlc/conversationIntro/)
2. Useful Sentences for Travel Survival
E. Learning English Online
1. Learning English
BBC World Service
(http://www.bbc.co.uk/worldservice/learningenglish/index.shtml)
2. Dave’s ESL Café
3. Learn English
British Council
(http://www.learnenglish.org.uk)
F. Miscellaneous
1. English Campus
A Hong Kong government funded website
(http://www.hkedcity.net/english)
2. Activities for ESL students
Over 100 English exercises and quizzes!
For senior students
(http://a4esl.org)
3. Dave’s ESL Cafe
Learn Phrasal Verb here!
(http://eslcafe.com/pv)
4. Karin’s ESL Partyland
Reading, quizzes, activities and games for both junior and senior students
(http://www.eslpartyland.com/students/inter.htm)
5. English-Zone
Grammar, idioms, study skills, and much more!
(http://english-zone.com/index.html)
6. Interesting Things for ESL students
Lots of English exercises and quizzes here!
(http://www.manythings.org)
7. The International Movie Database
Plot summary, movie review, memorial quotes and much more!
(http://us.imdb.com)