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