I may backcross you may backcross she may backcross we may backcross you may backcross they may backcross
V-ing form
I may be backcrossing you may be backcrossing she may be backcrossing we may be backcrossing you may be backcrossing they may be backcrossing
Perfect
I may have backcrossed you may have backcrossed she may have backcrossed we may have backcrossed you may have backcrossed they may have backcrossed
V-ing perfect
I may have been backcrossing you may have been backcrossing she may have been backcrossing we may have been backcrossing you may have been backcrossing they may have been backcrossing
Negation
Simple form
I may not backcross you may not backcross she may not backcross we may not backcross you may not backcross they may not backcross
V-ing form
I may not be backcrossing you may not be backcrossing she may not be backcrossing we may not be backcrossing you may not be backcrossing they may not be backcrossing
Perfect
I may not have backcrossed you may not have backcrossed she may not have backcrossed we may not have backcrossed you may not have backcrossed they may not have backcrossed
V-ing perfect
I may not have been backcrossing you may not have been backcrossing she may not have been backcrossing we may not have been backcrossing you may not have been backcrossing they may not have been backcrossing
Interrogative form
Simple form
may I backcross? may you backcross? may she backcross? may we backcross? may you backcross? may they backcross?
V-ing form
may I be backcrossing? may you be backcrossing? may she be backcrossing? may we be backcrossing? may you be backcrossing? may they be backcrossing?
Perfect
may I have backcrossed? may you have backcrossed? may she have backcrossed? may we have backcrossed? may you have backcrossed? may they have backcrossed?
V-ing perfect
may I have been backcrossing? may you have been backcrossing? may she have been backcrossing? may we have been backcrossing? may you have been backcrossing? may they have been backcrossing?
Interro-negative form
Simple form
may I not backcross? may you not backcross? may she not backcross? may we not backcross? may you not backcross? may they not backcross?
V-ing form
may I not be backcrossing? may you not be backcrossing? may she not be backcrossing? may we not be backcrossing? may you not be backcrossing? may they not be backcrossing?
Perfect
may I not have backcrossed? may you not have backcrossed? may she not have backcrossed? may we not have backcrossed? may you not have backcrossed? may they not have backcrossed?
V-ing perfect
may I not have been backcrossing? may you not have been backcrossing? may she not have been backcrossing? may we not have been backcrossing? may you not have been backcrossing? may they not have been backcrossing?