don't I center? don't you center? doesn't he center? don't we center? don't you center? don't they center?
Presente continuo
am I not centering? aren't you centering? isn't he centering? aren't we centering? aren't you centering? aren't they centering?
Pretérito
didn't I center? didn't you center? didn't he center? didn't we center? didn't you center? didn't they center?
Pretérito continuo
wasn't I centering? weren't you centering? wasn't he centering? weren't we centering? weren't you centering? weren't they centering?
Presente perfecto
haven't I centered? haven't you centered? hasn't he centered? haven't we centered? haven't you centered? haven't they centered?
Presente perfecto continuo
haven't I been centering? haven't you been centering? hasn't he been centering? haven't we been centering? haven't you been centering? haven't they been centering?
Pluscuamperfecto
hadn't I centered? hadn't you centered? hadn't he centered? hadn't we centered? hadn't you centered? hadn't they centered?
Pluscuamperfecto continuo
hadn't I been centering? hadn't you been centering? hadn't he been centering? hadn't we been centering? hadn't you been centering? hadn't they been centering?
Futuro simple
won't I center? won't you center? won't he center? won't we center? won't you center? won't they center?
Futuro continuo
won't I be centering? won't you be centering? won't he be centering? won't we be centering? won't you be centering? won't they be centering?
Futuro perfecto
won't I have centered? won't you have centered? won't he have centered? won't we have centered? won't you have centered? won't they have centered?
Futuro perfecto contínuo
won't I have been centering? won't you have been centering? won't he have been centering? won't we have been centering? won't you have been centering? won't they have been centering?
Condicional
Presente
wouldn't I center? wouldn't you center? wouldn't he center? wouldn't we center? wouldn't you center? wouldn't they center?
Presente continuo
wouldn't I be centering? wouldn't you be centering? wouldn't he be centering? wouldn't we be centering? wouldn't you be centering? wouldn't they be centering?
Passado
wouldn't I have centered? wouldn't you have centered? wouldn't he have centered? wouldn't we have centered? wouldn't you have centered? wouldn't they have centered?
Passado continuo
wouldn't I have been centering? wouldn't you have been centering? wouldn't he have been centering? wouldn't we have been centering? wouldn't you have been centering? wouldn't they have been centering?