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