can contribute
Verbo regular: contribute - contributed- contributed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can contribute
you can contribute
he can contribute
we can contribute
you can contribute
they can contribute 	I can be contributing
you can be contributing
he can be contributing
we can be contributing
you can be contributing
they can be contributing	I can have contributed
you can have contributed
he can have contributed
we can have contributed
you can have contributed
they can have contributed	I can have been contributing
you can have been contributing
he can have been contributing
we can have been contributing
you can have been contributing
they can have been contributing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't contribute
you can't contribute
he can't contribute
we can't contribute
you can't contribute
they can't contribute 	I can't be contributing
you can't be contributing
he can't be contributing
we can't be contributing
you can't be contributing
they can't be contributing	I can't have contributed
you can't have contributed
he can't have contributed
we can't have contributed
you can't have contributed
they can't have contributed	I can't have been contributing
you can't have been contributing
he can't have been contributing
we can't have been contributing
you can't have been contributing
they can't have been contributing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I contribute?
can you contribute?
can he contribute?
can we contribute?
can you contribute?
can they contribute? 	can I be contributing?
can you be contributing?
can he be contributing?
can we be contributing?
can you be contributing?
can they be contributing? 	can I have contributed?
can you have contributed?
can he have contributed?
can we have contributed?
can you have contributed?
can they have contributed? 	can I have been contributing?
can you have been contributing?
can he have been contributing?
can we have been contributing?
can you have been contributing?
can they have been contributing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I contribute?
can't you contribute?
can't he contribute?
can't we contribute?
can't you contribute?
can't they contribute? 	can't I be contributing?
can't you be contributing?
can't he be contributing?
can't we be contributing?
can't you be contributing?
can't they be contributing? 	can't I have contributed?
can't you have contributed?
can't he have contributed?
can't we have contributed?
can't you have contributed?
can't they have contributed? 	can't I have been contributing?
can't you have been contributing?
can't he have been contributing?
can't we have been contributing?
can't you have been contributing?
can't they have been contributing?