I don't contribute you don't contribute he doesn't contribute we don't contribute you don't contribute they don't contribute
Present continuous
I'm not contributing you aren't contributing he isn't contributing we aren't contributing you aren't contributing they aren't contributing
Preterite
I didn't contribute you didn't contribute he didn't contribute we didn't contribute you didn't contribute they didn't contribute
Preterite continuous
I wasn't contributing you weren't contributing he wasn't contributing we weren't contributing you weren't contributing they weren't contributing
Present perfect
I haven't contributed you haven't contributed he hasn't contributed we haven't contributed you haven't contributed they haven't contributed
Present perfect continuous
I haven't been contributing you haven't been contributing he hasn't been contributing we haven't been contributing you haven't been contributing they haven't been contributing
Pluperfect
I hadn't contributed you hadn't contributed he hadn't contributed we hadn't contributed you hadn't contributed they hadn't contributed
Pluperfect continuous
I hadn't been contributing you hadn't been contributing he hadn't been contributing we hadn't been contributing you hadn't been contributing they hadn't been contributing
Future
I won't contribute you won't contribute he won't contribute we won't contribute you won't contribute they won't contribute
Future continuous
I won't be contributing you won't be contributing he won't be contributing we won't be contributing you won't be contributing they won't be contributing
Future perfect
I won't have contributed you won't have contributed he won't have contributed we won't have contributed you won't have contributed they won't have contributed
Future perfect continuous
I won't have been contributing you won't have been contributing he won't have been contributing we won't have been contributing you won't have been contributing they won't have been contributing
Conditional
Present
I wouldn't contribute you wouldn't contribute he wouldn't contribute we wouldn't contribute you wouldn't contribute they wouldn't contribute
Present continuous
I wouldn't be contributing you wouldn't be contributing he wouldn't be contributing we wouldn't be contributing you wouldn't be contributing they wouldn't be contributing
Past
I wouldn't have contributed you wouldn't have contributed he wouldn't have contributed we wouldn't have contributed you wouldn't have contributed they wouldn't have contributed
Past continuous
I wouldn't have been contributing you wouldn't have been contributing he wouldn't have been contributing we wouldn't have been contributing you wouldn't have been contributing they wouldn't have been contributing
Imperative
Imperative
do not contribute Let's not contribute do not contribute