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