Notes on American English usage from a UK site (with helpful commentary).

"A guide to the differences between American and British English. Are there really any differences? Is US English a dialect of proper British English? These resources will let you know when to say Bonnet or Trunk."

An award-winning site by Professor Paul Brians. An excellent discussion of common mistakes that native English speakers make with vocabulary words. Helpful for advanced ESL students.

Learn English word by word - vocabulary topics, false friends, phrasal verbs, business vocabulary, slang all with a Czech perspective!

An entertaining and educational look at the Latin and Greek roots behind some common English words.

"This guide provides tips and resources for taking advantage of the abundant Vocabulary help with all kinds of language including: idiomatic language and difficult slang/jargon, professional English, specific Internet vocabulary, vocabulary guides and newsletters, as well as quizzes and vocabulary learning techniques."

"Most words used in the English language today were not originally English. These words were borrowed (taken) from other languages. The majority of English words have Latin or Greek origins. When taking the TOEFL* (Test of English as a Foreign Language), it is helpful to know some of these origins or "roots" of English vocabulary. It may be possible to guess the meaning of an unknown word when one knows the meaning of its root. Knowing prefixes and suffixes can also assist in the process."

"Separated into 3 levels of difficulty, these free interactive vocabulary puzzle and activity sessions use Latin and Greek "roots and cells" to help decode words. 7 links to current exercises include: Fill-in-the-Blanks, Definition Match, Synonym & Antonym Encounters, Crosswords, Word Finds, True/False and Word Stories. See our suggestions on How to use Vocabulary.com!"

A fun vocabulary game in which students either guess which definition is the true one for selected words, or make up their own fake definitions.

A fun game for learning the meanings of common idioms.