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 continuo
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?
Pretérito continuo
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 perfecto
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 perfecto continuo
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?
Pluscuamperfecto
hadn't I filtered? hadn't you filtered? hadn't he filtered? hadn't we filtered? hadn't you filtered? hadn't they filtered?
Pluscuamperfecto continuo
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 simple
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 continuo
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 perfecto
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 perfecto 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 continuo
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 continuo
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?