can backcross
Regular verb: backcross - backcrossed- backcrossed

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

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

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

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