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