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