I must backcross you must backcross he must backcross we must backcross you must backcross they must backcross
Forme en V-ing
I must be backcrossing you must be backcrossing he must be backcrossing we must be backcrossing you must be backcrossing they must be backcrossing
Perfect
I must have backcrossed you must have backcrossed he must have backcrossed we must have backcrossed you must have backcrossed they must have backcrossed
Perfect en V-ing
I must have been backcrossing you must have been backcrossing he must have been backcrossing we must have been backcrossing you must have been backcrossing they must have been backcrossing
Négation
Forme simple
I must not backcross you must not backcross he must not backcross we must not backcross you must not backcross they must not backcross
Forme en V-ing
I must not be backcrossing you must not be backcrossing he must not be backcrossing we must not be backcrossing you must not be backcrossing they must not be backcrossing
Perfect
I must not have backcrossed you must not have backcrossed he must not have backcrossed we must not have backcrossed you must not have backcrossed they must not have backcrossed
Perfect en V-ing
I must not have been backcrossing you must not have been backcrossing he must not have been backcrossing we must not have been backcrossing you must not have been backcrossing they must not have been backcrossing
Forme interrogative
Forme simple
must I backcross? must you backcross? must he backcross? must we backcross? must you backcross? must they backcross?
Forme en V-ing
must I be backcrossing? must you be backcrossing? must he be backcrossing? must we be backcrossing? must you be backcrossing? must they be backcrossing?
Perfect
must I have backcrossed? must you have backcrossed? must he have backcrossed? must we have backcrossed? must you have backcrossed? must they have backcrossed?
Perfect en V-ing
must I have been backcrossing? must you have been backcrossing? must he have been backcrossing? must we have been backcrossing? must you have been backcrossing? must they have been backcrossing?
Forme interro-négative
Forme simple
must I not backcross? must you not backcross? must he not backcross? must we not backcross? must you not backcross? must they not backcross?
Forme en V-ing
must I not be backcrossing? must you not be backcrossing? must he not be backcrossing? must we not be backcrossing? must you not be backcrossing? must they not be backcrossing?
Perfect
must I not have backcrossed? must you not have backcrossed? must he not have backcrossed? must we not have backcrossed? must you not have backcrossed? must they not have backcrossed?
Perfect en V-ing
must I not have been backcrossing? must you not have been backcrossing? must he not have been backcrossing? must we not have been backcrossing? must you not have been backcrossing? must they not have been backcrossing?