may preplan
Regular verb: preplan - preplaned- preplaned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may preplan
you may preplan
she may preplan
we may preplan
you may preplan
they may preplan 	I may be preplaning
you may be preplaning
she may be preplaning
we may be preplaning
you may be preplaning
they may be preplaning	I may have preplaned
you may have preplaned
she may have preplaned
we may have preplaned
you may have preplaned
they may have preplaned	I may have been preplaning
you may have been preplaning
she may have been preplaning
we may have been preplaning
you may have been preplaning
they may have been preplaning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't preplan
you mayn't preplan
she mayn't preplan
we mayn't preplan
you mayn't preplan
they mayn't preplan 	I mayn't be preplaning
you mayn't be preplaning
she mayn't be preplaning
we mayn't be preplaning
you mayn't be preplaning
they mayn't be preplaning	I mayn't have preplaned
you mayn't have preplaned
she mayn't have preplaned
we mayn't have preplaned
you mayn't have preplaned
they mayn't have preplaned	I mayn't have been preplaning
you mayn't have been preplaning
she mayn't have been preplaning
we mayn't have been preplaning
you mayn't have been preplaning
they mayn't have been preplaning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I preplan?
may you preplan?
may she preplan?
may we preplan?
may you preplan?
may they preplan? 	may I be preplaning?
may you be preplaning?
may she be preplaning?
may we be preplaning?
may you be preplaning?
may they be preplaning? 	may I have preplaned?
may you have preplaned?
may she have preplaned?
may we have preplaned?
may you have preplaned?
may they have preplaned? 	may I have been preplaning?
may you have been preplaning?
may she have been preplaning?
may we have been preplaning?
may you have been preplaning?
may they have been preplaning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I preplan?
mayn't you preplan?
mayn't she preplan?
mayn't we preplan?
mayn't you preplan?
mayn't they preplan? 	mayn't I be preplaning?
mayn't you be preplaning?
mayn't she be preplaning?
mayn't we be preplaning?
mayn't you be preplaning?
mayn't they be preplaning? 	mayn't I have preplaned?
mayn't you have preplaned?
mayn't she have preplaned?
mayn't we have preplaned?
mayn't you have preplaned?
mayn't they have preplaned? 	mayn't I have been preplaning?
mayn't you have been preplaning?
mayn't she have been preplaning?
mayn't we have been preplaning?
mayn't you have been preplaning?
mayn't they have been preplaning?