อ้างอิง
http://sorntisak.wordpress.com/category/chapter-2-active-and-passive-voice/subject-3-%E0%B9%82%E0%B8%84%E0%B8%A3%E0%B8%87%E0%B8%AA%E0%B8%A3%E0%B9%89%E0%B8%B2%E0%B8%87%E0%B8%82%E0%B8%AD%E0%B8%87passive-voice-%E0%B8%97%E0%B8%B1%E0%B9%89%E0%B8%87-12-tense/
http://blog.eduzones.com/reno/3199
http://grammar.exteen.com/20060822/past-participle-3
http://www.kr.ac.th/ebook/panjit/t2.html
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