ought to contribute
Verbo regular: contribute - contributed- contributed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I ought to contribute
you ought to contribute
she 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
she ought to be contributing
we ought to be contributing
you ought to be contributing
they ought to be contributing	I ought to have contributed
you ought to have contributed
she 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
she ought to have been contributing
we ought to have been contributing
you ought to have been contributing
they ought to have been contributing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I ought not to contribute
you ought not to contribute
she ought not to contribute
we ought not to contribute
you ought not to contribute
they ought not to contribute 	I ought not to contributing
you ought not to contributing
she ought not to contributing
we ought not to contributing
you ought not to contributing
they ought not to contributing	I ought not to have contributed
you ought not to have contributed
she ought not to have contributed
we ought not to have contributed
you ought not to have contributed
they ought not to have contributed	I ought not to have been contributing
you ought not to have been contributing
she ought not to have been contributing
we ought not to have been contributing
you ought not to have been contributing
they ought not to have been contributing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
ought to I contribute?
ought to you contribute?
ought to she 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 she be contributing?
ought to we be contributing?
ought to you be contributing?
ought to they be contributing? 	ought to I have contributed?
ought to you have contributed?
ought to she 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 she have been contributing?
ought to we have been contributing?
ought to you have been contributing?
ought to they have been contributing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
ought I not to contribute?
ought you not to contribute?
ought she not to contribute?
ought we not to contribute?
ought you not to contribute?
ought they not to contribute? 	ought I not to be contributing?
ought you not to be contributing?
ought she not to be contributing?
ought we not to be contributing?
ought you not to be contributing?
ought they not to be contributing? 	ought I not to have contributed?
ought you not to have contributed?
ought she not to have contributed?
ought we not to have contributed?
ought you not to have contributed?
ought they not to have contributed? 	ought I not to have been contributing?
ought you not to have been contributing?
ought she not to have been contributing?
ought we not to have been contributing?
ought you not to have been contributing?
ought they not to have been contributing?