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