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English practise for Diana's students

Perfect modals

http://www.esl-classroom.com/grammar/perfmodals2.html

 

http://www.learnamericanenglishonline.com/Yellow%20Level/Y12%20Perfect%20Modals.html

 

http://www.worldofenglish.com/exe.php?Tenses/Modal/modal_perfect.tra

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