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http://esl.about.com/library/grammar/blgr_advice.htm

http://www.eslgold.net/speaking/asking_giving_advice.html

http://www.english-zone.com/verbs/pssvchrt.html

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http://valenciaenglish.netfirms.com/presperf.htm

http://www.englishpage.com/verbpage/presentperfectcontinuous.html