English verb conjugation
OUGHT TO CONTRIBUTE

Regular verb: contribute - contributed - contributed

Affirmation

Simple form	V-ing form
I ought to contribute you ought to contribute he ought to contribute we ought to contribute you ought to contribute they ought to contribute	I ought to be contributing you ought to be contributing he ought to be contributing we ought to be contributing you ought to be contributing they ought to be contributing
Perfect	V-ing perfect
I ought to have contributed you ought to have contributed he ought to have contributed we ought to have contributed you ought to have contributed they ought to have contributed	I ought to have been contributing you ought to have been contributing he ought to have been contributing we ought to have been contributing you ought to have been contributing they ought to have been contributing

Negation

Simple form	V-ing form
I oughtn't to contribute you oughtn't to contribute he oughtn't to contribute we oughtn't to contribute you oughtn't to contribute they oughtn't to contribute	I oughtn't to be contributing you oughtn't to be contributing he oughtn't to be contributing we oughtn't to be contributing you oughtn't to be contributing they oughtn't to be contributing
Perfect	V-ing perfect
I oughtn't to have contributed you oughtn't to have contributed he oughtn't to have contributed we oughtn't to have contributed you oughtn't to have contributed they oughtn't to have contributed	I oughtn't to have been contributing you oughtn't to have been contributing he oughtn't to have been contributing we oughtn't to have been contributing you oughtn't to have been contributing they oughtn't to have been contributing

Interrogative form

Simple form	V-ing form
ought to I contribute? ought to you contribute? ought to he contribute? ought to we contribute? ought to you contribute? ought to they contribute?	ought to I be contributing? ought to you be contributing? ought to he be contributing? ought to we be contributing? ought to you be contributing? ought to they be contributing?
Perfect	V-ing perfect
ought to I have contributed? ought to you have contributed? ought to he have contributed? ought to we have contributed? ought to you have contributed? ought to they have contributed?	ought to I have been contributing? ought to you have been contributing? ought to he have been contributing? ought to we have been contributing? ought to you have been contributing? ought to they have been contributing?

Interro-negative form

Simple form	V-ing form
oughtn't I to contribute? oughtn't you to contribute? oughtn't he to contribute? oughtn't we to contribute? oughtn't you to contribute? oughtn't they to contribute?	oughtn't I to be contributing? oughtn't you to be contributing? oughtn't he to be contributing? oughtn't we to be contributing? oughtn't you to be contributing? oughtn't they to be contributing?
Perfect	V-ing perfect
oughtn't I to have contributed? oughtn't you to have contributed? oughtn't he to have contributed? oughtn't we to have contributed? oughtn't you to have contributed? oughtn't they to have contributed?	oughtn't I to have been contributing? oughtn't you to have been contributing? oughtn't he to have been contributing? oughtn't we to have been contributing? oughtn't you to have been contributing? oughtn't they to have been contributing?