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