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