Recommended Resources

Dictionaries

• British English 
  http://www.oxforddictionaries.com/
• American English 
  http://www.merriam-webster.com/
• Collocation dictionary
  http://www.ozdic.com/collocation-dictionary
  

English Language Corpus

• British National Corpus 
  http://www.natcorp.ox.ac.uk/
• Corpus of Contemporary American English (COCA)
  http://corpus.byu.edu/coca/
• Cambridge English Corpus
  http://www.cambridge.org/us/cambridgeenglish/about-cambridge-english/cambridge-english-corpus

English Language Resources

• English as a Second Language Online 
  http://www.usingenglish.com/
• Learn English 
  http://learnenglish.britishcouncil.org/en/
• American English
   http://americanenglish.state.gov/materials-learning-english
•  iVocab (Mobile application)
  Available on the CUHK Mobile App Store: https://campusapps.itsc.cuhk.edu.hk/store/