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