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