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