Conjugação do verbo inglês
COULD CONTRIBUTE

Verbo regular: contribute - contributed - contributed

Afirmação

Forma simple	Forma com V-ing
I could contribute you could contribute she could contribute we could contribute you could contribute they could contribute	I could be contributing you could be contributing she could be contributing we could be contributing you could be contributing they could be contributing
Perfeito	Perfeito com V-ing
I could have contributed you could have contributed she could have contributed we could have contributed you could have contributed they could have contributed	I could have been contributing you could have been contributing she could have been contributing we could have been contributing you could have been contributing they could have been contributing

Negação

Forma simple	Forma com V-ing
I couldn't contribute you couldn't contribute she couldn't contribute we couldn't contribute you couldn't contribute they couldn't contribute	I couldn't be contributing you couldn't be contributing she couldn't be contributing we couldn't be contributing you couldn't be contributing they couldn't be contributing
Perfeito	Perfeito com V-ing
I couldn't have contributed you couldn't have contributed she couldn't have contributed we couldn't have contributed you couldn't have contributed they couldn't have contributed	I couldn't have been contributing you couldn't have been contributing she couldn't have been contributing we couldn't have been contributing you couldn't have been contributing they couldn't have been contributing

Forma interrogativa

Forma simple	Forma com V-ing
could I contribute? could you contribute? could she contribute? could we contribute? could you contribute? could they contribute?	could I be contributing? could you be contributing? could she be contributing? could we be contributing? could you be contributing? could they be contributing?
Perfeito	Perfeito com V-ing
could I have contributed? could you have contributed? could she have contributed? could we have contributed? could you have contributed? could they have contributed?	could I have been contributing? could you have been contributing? could she have been contributing? could we have been contributing? could you have been contributing? could they have been contributing?

Forma interro-Negação

Forma simple	Forma com V-ing
couldn't I contribute? couldn't you contribute? couldn't she contribute? couldn't we contribute? couldn't you contribute? couldn't they contribute?	couldn't I be contributing? couldn't you be contributing? couldn't she be contributing? couldn't we be contributing? couldn't you be contributing? couldn't they be contributing?
Perfeito	Perfeito com V-ing
couldn't I have contributed? couldn't you have contributed? couldn't she have contributed? couldn't we have contributed? couldn't you have contributed? couldn't they have contributed?	couldn't I have been contributing? couldn't you have been contributing? couldn't she have been contributing? couldn't we have been contributing? couldn't you have been contributing? couldn't they have been contributing?