*Defining relative clauses: http://www.perfect-english-grammar.com/support-files/relative_clauses_exercise_3.pdf
*Non-defining relative clauses: http://www.autoenglish.org/generalgrammar/gr.nonrelat.pdf
*Modal verbs 1: http://www.autoenglish.org/modalverbs/gr.must.pdf
*Modal verbs 2: http://www.autoenglish.org/modalverbs/gr.mustnt.pdf
*Modal verbs 3: http://www.autoenglish.org/gr.can.pdf
*Modal verbs 4: http://www.grammarbank.com/modal-verbs-test.html
*Future tenses 1: http://www.englisch-hilfen.de/en/exercises/tenses/future.htm
*Future tenses 2: http://www.english-4u.de/future_ex3.htm
*Future tenses 3: http://www.englishlessonsbrighton.co.uk/future-tenses-exercise/
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