https://drive.google.com/file/d/0B-2fvJUBid2yN043V1NIN05PQm8/view?usp=sharing
https://drive.google.com/file/d/0B-2fvJUBid2yVldfTEJEOGthVm8/view?usp=sharing
http://www.perfect-english-grammar.com/present-perfect-use.html
http://esl.fis.edu/grammar/rules/future.htm
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