don't I backcross? don't you backcross? doesn't he backcross? don't we backcross? don't you backcross? don't they backcross?
Present continuous
am I not backcrossing? aren't you backcrossing? isn't he backcrossing? aren't we backcrossing? aren't you backcrossing? aren't they backcrossing?
Preterite
didn't I backcross? didn't you backcross? didn't he backcross? didn't we backcross? didn't you backcross? didn't they backcross?
Preterite continuous
wasn't I backcrossing? weren't you backcrossing? wasn't he backcrossing? weren't we backcrossing? weren't you backcrossing? weren't they backcrossing?
Present perfect
haven't I backcrossed? haven't you backcrossed? hasn't he backcrossed? haven't we backcrossed? haven't you backcrossed? haven't they backcrossed?
Present perfect continuous
haven't I been backcrossing? haven't you been backcrossing? hasn't he been backcrossing? haven't we been backcrossing? haven't you been backcrossing? haven't they been backcrossing?
Pluperfect
hadn't I backcrossed? hadn't you backcrossed? hadn't he backcrossed? hadn't we backcrossed? hadn't you backcrossed? hadn't they backcrossed?
Pluperfect continuous
hadn't I been backcrossing? hadn't you been backcrossing? hadn't he been backcrossing? hadn't we been backcrossing? hadn't you been backcrossing? hadn't they been backcrossing?
Future
won't I backcross? won't you backcross? won't he backcross? won't we backcross? won't you backcross? won't they backcross?
Future continuous
won't I be backcrossing? won't you be backcrossing? won't he be backcrossing? won't we be backcrossing? won't you be backcrossing? won't they be backcrossing?
Future perfect
won't I have backcrossed? won't you have backcrossed? won't he have backcrossed? won't we have backcrossed? won't you have backcrossed? won't they have backcrossed?
Future perfect continuous
won't I have been backcrossing? won't you have been backcrossing? won't he have been backcrossing? won't we have been backcrossing? won't you have been backcrossing? won't they have been backcrossing?
Conditional
Present
wouldn't I backcross? wouldn't you backcross? wouldn't he backcross? wouldn't we backcross? wouldn't you backcross? wouldn't they backcross?
Present continuous
wouldn't I be backcrossing? wouldn't you be backcrossing? wouldn't he be backcrossing? wouldn't we be backcrossing? wouldn't you be backcrossing? wouldn't they be backcrossing?
Past
wouldn't I have backcrossed? wouldn't you have backcrossed? wouldn't he have backcrossed? wouldn't we have backcrossed? wouldn't you have backcrossed? wouldn't they have backcrossed?
Past continuous
wouldn't I have been backcrossing? wouldn't you have been backcrossing? wouldn't he have been backcrossing? wouldn't we have been backcrossing? wouldn't you have been backcrossing? wouldn't they have been backcrossing?