Passive Voice

http://www.unc.edu/depts/wcweb/handouts/passivevoice.html

http://www.sdc.uwo.ca/writing/handouts/Active%20and%20Passive%20Voice.pdf

http://web.uvic.ca/wguide/Pages/SentPassiveVoice.html

http://www.queensu.ca/writingcentre/handouts/passivevoice.pdf