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