TUTORIALS:
* Mixed Perfect Modals: http://www.youtube.com/watch?v=27bMmSi9PJk
- Might and May Have: http://www.youtube.com/watch?v=tcs1CPVWYpM
- Could Have: http://www.youtube.com/watch?v=txAlwLNdF2A
- Should Have: http://www.youtube.com/watch?v=PbtvGdiuUi4
EXPLANATION:
http://udl.lf1.cuni.cz/Data/Documents/81362705-5C9D-45A4-8AA1-DE1CE7F8A6BD/perfect-infinitive-with-modal-verbs_1.pdf
ACTIVITIES:
http://www.autoenglish.org/modalverbs/gr.might.pdf
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