should backcross
Regular verb: backcross - backcrossed- backcrossed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd backcross
you'd backcross
he'd backcross
we'd backcross
you'd backcross
they'd backcross 	I'd be backcrossing
you'd be backcrossing
he'd be backcrossing
we'd be backcrossing
you'd be backcrossing
they'd be backcrossing	I should've backcrossed
you should've backcrossed
he should've backcrossed
we should've backcrossed
you should've backcrossed
they should've backcrossed	I should've been backcrossing
you should've been backcrossing
he should've been backcrossing
we should've been backcrossing
you should've been backcrossing
they should've been backcrossing	

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

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

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