s/o.*ra/onaraion/
s/iwa/&n/
s/tou/&sagi/
s/nwa/&ni/
s/you$/&nagi/
s/ekimasu/&kanku/
s/akima/&u/
s/aima/&nbou/
s/ama/&usu/
s/^su.*/yukaina /
s/^m.*/tanoshii /
s/ /&nakamaga popopopo-n/