Dec 3, 2014: C1.1

Present Perfect/ present perfect continuous:

http://www.grammar-quizzes.com/presp-diagnostic.html

Past Perfect:

http://english-zone.com/verbs/pstperf1.html

Past Perfect Continuous:

http://first-english.org/english_learning/english_tenses/past_perfect_progressive/80_past_perfect_continuous_tests.htm

Future Perfect:

http://www.learnenglishfeelgood.com/esl-future-perfect-tense1.html

http://www.learnenglishfeelgood.com/esl-future-perfect-tense2.html

http://www.eslmania.com/students/grammar/Grammar_Quizzes/future_perfect.htm

Further explanations:

https://owl.english.purdue.edu/owl/resource/601/01/

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