Regular verb: contribute - contributed - contributed
Present | Present continuous | Preterite | Preterite continuous |
don't I contribute? don't you contribute? doesn't she contribute? don't we contribute? don't you contribute? don't they contribute? | am I not contributing? aren't you contributing? isn't she contributing? aren't we contributing? aren't you contributing? aren't they contributing? | didn't I contribute? didn't you contribute? didn't she contribute? didn't we contribute? didn't you contribute? didn't they contribute? | wasn't I contributing? weren't you contributing? wasn't she contributing? weren't we contributing? weren't you contributing? weren't they contributing? |
Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous |
haven't I contributed? haven't you contributed? hasn't she contributed? haven't we contributed? haven't you contributed? haven't they contributed? | haven't I been contributing? haven't you been contributing? hasn't she been contributing? haven't we been contributing? haven't you been contributing? haven't they been contributing? | hadn't I contributed? hadn't you contributed? hadn't she contributed? hadn't we contributed? hadn't you contributed? hadn't they contributed? | hadn't I been contributing? hadn't you been contributing? hadn't she been contributing? hadn't we been contributing? hadn't you been contributing? hadn't they been contributing? |
Future | Future continuous | Future perfect | Future perfect continuous |
won't I contribute? won't you contribute? won't she contribute? won't we contribute? won't you contribute? won't they contribute? | won't I be contributing? won't you be contributing? won't she be contributing? won't we be contributing? won't you be contributing? won't they be contributing? | won't I have contributed? won't you have contributed? won't she have contributed? won't we have contributed? won't you have contributed? won't they have contributed? | won't I have been contributing? won't you have been contributing? won't she have been contributing? won't we have been contributing? won't you have been contributing? won't they have been contributing? |
Present | Present continuous | Past | Past continuous |
wouldn't I contribute? wouldn't you contribute? wouldn't she contribute? wouldn't we contribute? wouldn't you contribute? wouldn't they contribute? | wouldn't I be contributing? wouldn't you be contributing? wouldn't she be contributing? wouldn't we be contributing? wouldn't you be contributing? wouldn't they be contributing? | wouldn't I have contributed? wouldn't you have contributed? wouldn't she have contributed? wouldn't we have contributed? wouldn't you have contributed? wouldn't they have contributed? | wouldn't I have been contributing? wouldn't you have been contributing? wouldn't she have been contributing? wouldn't we have been contributing? wouldn't you have been contributing? wouldn't they have been contributing? |
Infinitive | Imperative |
Infinitive | Imperative | ||
to contribute | - - - |
Present | Past | ||
contributing | contributed |