Grammar
https://netfiles.uiuc.edu/k-lee7/www/kesl/writ/inversion_sv.pdf
Exercises
http://www.edufind.com/english/englishtests/english_test_explanation.cfm?TestID=9
http://www.cityu.edu.hk/elc/quiz/inverse.htm
http://www.eslprintables.com/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=subject+verb
http://www.english4today.com/oeg/pcontent/englishtests/english_tests1.cfm?TestID=9&TestName=Subject-Verb%20Inversion
http://www.cityu.edu.hk/elc/quiz/inverse.htm
https://netfiles.uiuc.edu/k-lee7/www/kesl/writ/inversion_sv.pdf
Exercises
http://www.edufind.com/english/englishtests/english_test_explanation.cfm?TestID=9
http://www.cityu.edu.hk/elc/quiz/inverse.htm
http://www.eslprintables.com/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=subject+verb
http://www.english4today.com/oeg/pcontent/englishtests/english_tests1.cfm?TestID=9&TestName=Subject-Verb%20Inversion
http://www.cityu.edu.hk/elc/quiz/inverse.htm