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Hello my classes,
You can find many exercises for your main course.
These are the grammar and vocabulary exercises for your book New English File Pre-intermediate for each unit:
http://elt.oup.com/student/englishfile/preint/?cc=tr&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/?cc=tr&selLanguage=en
http://elt.oup.com/student/englishfile/preint/b_vocabulary/?cc=tr&selLanguage=en
http://elt.oup.com/student/englishfile/preint/i_games/?cc=tr&selLanguage=en
http://elt.oup.com/student/englishfile/preint/g_ef_pre_builder?cc=tr&selLanguage=en
http://elt.oup.com/student/englishfile/preint/e_phrasebank/?cc=tr&selLanguage=en