could comment
Verbo regular: comment - commented- commented

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could comment
you could comment
she could comment
we could comment
you could comment
they could comment 	I could be commenting
you could be commenting
she could be commenting
we could be commenting
you could be commenting
they could be commenting	I could have commented
you could have commented
she could have commented
we could have commented
you could have commented
they could have commented	I could have been commenting
you could have been commenting
she could have been commenting
we could have been commenting
you could have been commenting
they could have been commenting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't comment
you couldn't comment
she couldn't comment
we couldn't comment
you couldn't comment
they couldn't comment 	I couldn't be commenting
you couldn't be commenting
she couldn't be commenting
we couldn't be commenting
you couldn't be commenting
they couldn't be commenting	I couldn't have commented
you couldn't have commented
she couldn't have commented
we couldn't have commented
you couldn't have commented
they couldn't have commented	I couldn't have been commenting
you couldn't have been commenting
she couldn't have been commenting
we couldn't have been commenting
you couldn't have been commenting
they couldn't have been commenting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I comment?
could you comment?
could she comment?
could we comment?
could you comment?
could they comment? 	could I be commenting?
could you be commenting?
could she be commenting?
could we be commenting?
could you be commenting?
could they be commenting? 	could I have commented?
could you have commented?
could she have commented?
could we have commented?
could you have commented?
could they have commented? 	could I have been commenting?
could you have been commenting?
could she have been commenting?
could we have been commenting?
could you have been commenting?
could they have been commenting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I comment?
couldn't you comment?
couldn't she comment?
couldn't we comment?
couldn't you comment?
couldn't they comment? 	couldn't I be commenting?
couldn't you be commenting?
couldn't she be commenting?
couldn't we be commenting?
couldn't you be commenting?
couldn't they be commenting? 	couldn't I have commented?
couldn't you have commented?
couldn't she have commented?
couldn't we have commented?
couldn't you have commented?
couldn't they have commented? 	couldn't I have been commenting?
couldn't you have been commenting?
couldn't she have been commenting?
couldn't we have been commenting?
couldn't you have been commenting?
couldn't they have been commenting?