https://drive.google.com/file/d/0B88kSUaIHuMAb2dBeDBsdmRyc0k/view?usp=sharing
https://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_c01?cc=us&selLanguage=en
http://a4esl.org/q/h/9901/jd-pronouns.html
http://www.1-language.com/englishcourse/unit8_dialogues_exs.htm
https://elt.oup.com/student/englishfile/elementary/a_grammar/file04/grammar04_c02?cc=us&selLanguage=en
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