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                   http://www.angelfire.com/folk/witpong/part_continuous.htm


                   http://www.lks.ac.th/teacher_jonggonee/jongdream/ex_part_perfect.html


                   http://pioneer.chula.ac.th/~rantikar/Grammar.html


                   http://www.englishub.com/index.php?lay=show&article&Id=568702&Ntype=12

                   http://fds.oup.com/www.oup.com/pdf/elt/catalogue/0-19-436624-3-b.pdf


                   http://www.znanje.org/knjige/english/grammar/verbs/pastperf.htm


                   http://train.doae.go.th


                   http://www.lks.ac.th/teacher_jonggonee/jongdream/past_cont.html


                   http://grammar.ccc.commnet.edu/GRAMMAR/cgi-shl/quiz.pl/sentence_types_quiz_form=1

                   http://www.kw.ac.th/pitak/k3_online/complex1.html


                   http://englishpage.com/verbpage/presentperfect.html


                   http://angelfire.com/folk/witpong/present_perfect.htm


                   http://www.englishpage.com


                   http://www.cmw.ac.th/elibrary/fileselibrary/English/.../sex3p01.htm

                   http://www.englishclub.com/.../verb-tenses_present-perfect.htm


                   http://en.wikipedia.org/wiki/Present_perfect_tense


                   http://train.doae.go.th/…/present_perfect_tense_subject.htm


                   http://www.eclecticenglish.com/grammar/PresentPerfect1A.html


                   http://thaigoodview.com/node/20056

                   http://www.uni.edu


                   http://www.thailandvoyage.com


                   http://www.freewebs.com/wichimakyou/ReportedSpeech.htm


                   http://www.geocities.com/perfectlarc/direct/direct.html
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