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