Unit 2: Being Human (Resources)

Present Perfect Negative and affirmative

https://drive.google.com/file/d/0B30WrHeePNVVOHdLRm9LNlg4QThBVHh4eVRVeFNNQ2NkcV9Z/view?usp=sharing

http://moviesegmentstoassessgrammargoals.blogspot.com.es/2011/01/rebound-present-perfect.html


http://www.englisch-hilfen.de/en/grammar/present_perfect_form.htm


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