may menstruate
Regular verb: menstruate - menstruated- menstruated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may menstruate
you may menstruate
he may menstruate
we may menstruate
you may menstruate
they may menstruate 	I may be menstruating
you may be menstruating
he may be menstruating
we may be menstruating
you may be menstruating
they may be menstruating	I may have menstruated
you may have menstruated
he may have menstruated
we may have menstruated
you may have menstruated
they may have menstruated	I may have been menstruating
you may have been menstruating
he may have been menstruating
we may have been menstruating
you may have been menstruating
they may have been menstruating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't menstruate
you mayn't menstruate
he mayn't menstruate
we mayn't menstruate
you mayn't menstruate
they mayn't menstruate 	I mayn't be menstruating
you mayn't be menstruating
he mayn't be menstruating
we mayn't be menstruating
you mayn't be menstruating
they mayn't be menstruating	I mayn't have menstruated
you mayn't have menstruated
he mayn't have menstruated
we mayn't have menstruated
you mayn't have menstruated
they mayn't have menstruated	I mayn't have been menstruating
you mayn't have been menstruating
he mayn't have been menstruating
we mayn't have been menstruating
you mayn't have been menstruating
they mayn't have been menstruating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I menstruate?
may you menstruate?
may he menstruate?
may we menstruate?
may you menstruate?
may they menstruate? 	may I be menstruating?
may you be menstruating?
may he be menstruating?
may we be menstruating?
may you be menstruating?
may they be menstruating? 	may I have menstruated?
may you have menstruated?
may he have menstruated?
may we have menstruated?
may you have menstruated?
may they have menstruated? 	may I have been menstruating?
may you have been menstruating?
may he have been menstruating?
may we have been menstruating?
may you have been menstruating?
may they have been menstruating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I menstruate?
mayn't you menstruate?
mayn't he menstruate?
mayn't we menstruate?
mayn't you menstruate?
mayn't they menstruate? 	mayn't I be menstruating?
mayn't you be menstruating?
mayn't he be menstruating?
mayn't we be menstruating?
mayn't you be menstruating?
mayn't they be menstruating? 	mayn't I have menstruated?
mayn't you have menstruated?
mayn't he have menstruated?
mayn't we have menstruated?
mayn't you have menstruated?
mayn't they have menstruated? 	mayn't I have been menstruating?
mayn't you have been menstruating?
mayn't he have been menstruating?
mayn't we have been menstruating?
mayn't you have been menstruating?
mayn't they have been menstruating?