don't I contribute? don't you contribute? doesn't he contribute? don't we contribute? don't you contribute? don't they contribute?
Présent continu
am I not contributing? aren't you contributing? isn't he contributing? aren't we contributing? aren't you contributing? aren't they contributing?
Prétérit
didn't I contribute? didn't you contribute? didn't he contribute? didn't we contribute? didn't you contribute? didn't they contribute?
Prétérit
wasn't I contributing? weren't you contributing? wasn't he contributing? weren't we contributing? weren't you contributing? weren't they contributing?
Present perfect
haven't I contributed? haven't you contributed? hasn't he contributed? haven't we contributed? haven't you contributed? haven't they contributed?
Present perfect continu
haven't I been contributing? haven't you been contributing? hasn't he been contributing? haven't we been contributing? haven't you been contributing? haven't they been contributing?
Pluperfect
hadn't I contributed? hadn't you contributed? hadn't he contributed? hadn't we contributed? hadn't you contributed? hadn't they contributed?
Pluperfect continu
hadn't I been contributing? hadn't you been contributing? hadn't he been contributing? hadn't we been contributing? hadn't you been contributing? hadn't they been contributing?
Futur
won't I contribute? won't you contribute? won't he contribute? won't we contribute? won't you contribute? won't they contribute?
Futur continu
won't I be contributing? won't you be contributing? won't he be contributing? won't we be contributing? won't you be contributing? won't they be contributing?
Futur antérieur
won't I have contributed? won't you have contributed? won't he have contributed? won't we have contributed? won't you have contributed? won't they have contributed?
Futur antérieur continu
won't I have been contributing? won't you have been contributing? won't he have been contributing? won't we have been contributing? won't you have been contributing? won't they have been contributing?
Conditionnel
Présent
wouldn't I contribute? wouldn't you contribute? wouldn't he contribute? wouldn't we contribute? wouldn't you contribute? wouldn't they contribute?
Présent continu
wouldn't I be contributing? wouldn't you be contributing? wouldn't he be contributing? wouldn't we be contributing? wouldn't you be contributing? wouldn't they be contributing?
Passé
wouldn't I have contributed? wouldn't you have contributed? wouldn't he have contributed? wouldn't we have contributed? wouldn't you have contributed? wouldn't they have contributed?
Passé continu
wouldn't I have been contributing? wouldn't you have been contributing? wouldn't he have been contributing? wouldn't we have been contributing? wouldn't you have been contributing? wouldn't they have been contributing?