Explanation:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/prperf.htm
Exercise:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/prperf1.htm
Explanation, part 2:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf.htm
Exercise, part 2:
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm
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