don't I stumble? don't you stumble? doesn't he stumble? don't we stumble? don't you stumble? don't they stumble?
Presente contínuo
am I not stumbling? aren't you stumbling? isn't he stumbling? aren't we stumbling? aren't you stumbling? aren't they stumbling?
Pretérito
didn't I stumble? didn't you stumble? didn't he stumble? didn't we stumble? didn't you stumble? didn't they stumble?
Preterito contínuo
wasn't I stumbling? weren't you stumbling? wasn't he stumbling? weren't we stumbling? weren't you stumbling? weren't they stumbling?
Presente perfeito
haven't I stumbled? haven't you stumbled? hasn't he stumbled? haven't we stumbled? haven't you stumbled? haven't they stumbled?
Presente perfeito contínuo
haven't I been stumbling? haven't you been stumbling? hasn't he been stumbling? haven't we been stumbling? haven't you been stumbling? haven't they been stumbling?
Mais perfeito
hadn't I stumbled? hadn't you stumbled? hadn't he stumbled? hadn't we stumbled? hadn't you stumbled? hadn't they stumbled?
Contínuo mais perfeito
hadn't I been stumbling? hadn't you been stumbling? hadn't he been stumbling? hadn't we been stumbling? hadn't you been stumbling? hadn't they been stumbling?
Futuro
won't I stumble? won't you stumble? won't he stumble? won't we stumble? won't you stumble? won't they stumble?
Futuro contínuo
won't I be stumbling? won't you be stumbling? won't he be stumbling? won't we be stumbling? won't you be stumbling? won't they be stumbling?
futuro perfeito
won't I have stumbled? won't you have stumbled? won't he have stumbled? won't we have stumbled? won't you have stumbled? won't they have stumbled?
futuro perfeito contínuo
won't I have been stumbling? won't you have been stumbling? won't he have been stumbling? won't we have been stumbling? won't you have been stumbling? won't they have been stumbling?
Condicional
Presente
wouldn't I stumble? wouldn't you stumble? wouldn't he stumble? wouldn't we stumble? wouldn't you stumble? wouldn't they stumble?
Presente contínuo
wouldn't I be stumbling? wouldn't you be stumbling? wouldn't he be stumbling? wouldn't we be stumbling? wouldn't you be stumbling? wouldn't they be stumbling?
Passado
wouldn't I have stumbled? wouldn't you have stumbled? wouldn't he have stumbled? wouldn't we have stumbled? wouldn't you have stumbled? wouldn't they have stumbled?
Passado contínuo
wouldn't I have been stumbling? wouldn't you have been stumbling? wouldn't he have been stumbling? wouldn't we have been stumbling? wouldn't you have been stumbling? wouldn't they have been stumbling?