Modal verbs

Affirmative
I You He She It We You They	may	go come work live speak ...

Negative
I You He She It We You They	may not	go come work live speak ...

Interrogative
May	I you he she it we you they	go ? come ? work ? live ? speak ? ...

http://www.elearnenglishlanguage.com/blog/aprenda-ingles/gramatica/verbos-modales1/

http://www.sherton.com.ar/modales/modales3.htm

http://biblehub.com/proverbs/5-19.htm

http://www.agendaweb.org/verbs/modals-may-might-exercises.html

http://en.wikipedia.org/wiki/Modal_verb

http://www.webmd.com/balance/guide/choosing-to-be-happy

http://thehappinessblogger.com/make-happiness-priority/