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Useful link to web for Nivel Básico 2
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INTERMEDIATE grammar tests with instant feedback and grammatical explanations- Interactive
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English grammar lessons on line
BBC Skillswise Word grammar and Sentence Grammar
Revise your tenses Printable exercises with key
English Grammar Reference and Exercises : Quick grammar reference
English Grammar Lessons and Tests : Use of punctuation and Parts of the Speech: adjectives, adverbs, conjunctions, interjections, nouns, pronouns, prepositions, verbs and more in an alphabetical order list.
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Grammar Reference Online- http://www.ucl.ac.uk/internet-grammar/
Grammar interactive Exercises Online- http://www.esltower.com/grammar.html
Advance English Grammar Exercises - http://www.rong-chang.com/ex/contents.htm
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Check your Grammar- With an index by topic
Grammar Theory- Tests to revise your grammatical knowledge
Revise your Tenses- Exercises to print Revision on tenses by the British Council