may backcross
Regular verb: backcross - backcrossed- backcrossed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may backcross
you may backcross
he may backcross
we may backcross
you may backcross
they may backcross 	I may be backcrossing
you may be backcrossing
he may be backcrossing
we may be backcrossing
you may be backcrossing
they may be backcrossing	I may have backcrossed
you may have backcrossed
he may have backcrossed
we may have backcrossed
you may have backcrossed
they may have backcrossed	I may have been backcrossing
you may have been backcrossing
he may have been backcrossing
we may have been backcrossing
you may have been backcrossing
they may have been backcrossing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't backcross
you mayn't backcross
he mayn't backcross
we mayn't backcross
you mayn't backcross
they mayn't backcross 	I mayn't be backcrossing
you mayn't be backcrossing
he mayn't be backcrossing
we mayn't be backcrossing
you mayn't be backcrossing
they mayn't be backcrossing	I mayn't have backcrossed
you mayn't have backcrossed
he mayn't have backcrossed
we mayn't have backcrossed
you mayn't have backcrossed
they mayn't have backcrossed	I mayn't have been backcrossing
you mayn't have been backcrossing
he mayn't have been backcrossing
we mayn't have been backcrossing
you mayn't have been backcrossing
they mayn't have been backcrossing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I backcross?
may you backcross?
may he backcross?
may we backcross?
may you backcross?
may they backcross? 	may I be backcrossing?
may you be backcrossing?
may he be backcrossing?
may we be backcrossing?
may you be backcrossing?
may they be backcrossing? 	may I have backcrossed?
may you have backcrossed?
may he have backcrossed?
may we have backcrossed?
may you have backcrossed?
may they have backcrossed? 	may I have been backcrossing?
may you have been backcrossing?
may he have been backcrossing?
may we have been backcrossing?
may you have been backcrossing?
may they have been backcrossing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I backcross?
mayn't you backcross?
mayn't he backcross?
mayn't we backcross?
mayn't you backcross?
mayn't they backcross? 	mayn't I be backcrossing?
mayn't you be backcrossing?
mayn't he be backcrossing?
mayn't we be backcrossing?
mayn't you be backcrossing?
mayn't they be backcrossing? 	mayn't I have backcrossed?
mayn't you have backcrossed?
mayn't he have backcrossed?
mayn't we have backcrossed?
mayn't you have backcrossed?
mayn't they have backcrossed? 	mayn't I have been backcrossing?
mayn't you have been backcrossing?
mayn't he have been backcrossing?
mayn't we have been backcrossing?
mayn't you have been backcrossing?
mayn't they have been backcrossing?