can comment
Verbo regular: comment - commented- commented

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

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

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

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