Present Perfect or Past Perfect?

توضیحات:

http://www.engvid.com "I have eaten." "I had eaten." What's the difference, and when do use each form? In this important grammar lesson, learn how to disting...

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tenses, present, perfect, past, perfect, english, grammar, english-grammar, english-lesson, lessons, learn-english, intermediate, engvid, jamesesl, toefl, toef...

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