can backcross
Verbe régulier : backcross - backcrossed- backcrossed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I can't backcross
you can't backcross
he can't backcross
we can't backcross
you can't backcross
they can't backcross 	I can't be backcrossing
you can't be backcrossing
he can't be backcrossing
we can't be backcrossing
you can't be backcrossing
they can't be backcrossing	I can't have backcrossed
you can't have backcrossed
he can't have backcrossed
we can't have backcrossed
you can't have backcrossed
they can't have backcrossed	I can't have been backcrossing
you can't have been backcrossing
he can't have been backcrossing
we can't have been backcrossing
you can't have been backcrossing
they can't have been backcrossing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can't I backcross?
can't you backcross?
can't he backcross?
can't we backcross?
can't you backcross?
can't they backcross? 	can't I be backcrossing?
can't you be backcrossing?
can't he be backcrossing?
can't we be backcrossing?
can't you be backcrossing?
can't they be backcrossing? 	can't I have backcrossed?
can't you have backcrossed?
can't he have backcrossed?
can't we have backcrossed?
can't you have backcrossed?
can't they have backcrossed? 	can't I have been backcrossing?
can't you have been backcrossing?
can't he have been backcrossing?
can't we have been backcrossing?
can't you have been backcrossing?
can't they have been backcrossing?