could concern
Verbo regular: concern - concerned- concerned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could concern
you could concern
she could concern
we could concern
you could concern
they could concern 	I could be concerning
you could be concerning
she could be concerning
we could be concerning
you could be concerning
they could be concerning	I could have concerned
you could have concerned
she could have concerned
we could have concerned
you could have concerned
they could have concerned	I could have been concerning
you could have been concerning
she could have been concerning
we could have been concerning
you could have been concerning
they could have been concerning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not concern
you could not concern
she could not concern
we could not concern
you could not concern
they could not concern 	I could not be concerning
you could not be concerning
she could not be concerning
we could not be concerning
you could not be concerning
they could not be concerning	I could not have concerned
you could not have concerned
she could not have concerned
we could not have concerned
you could not have concerned
they could not have concerned	I could not have been concerning
you could not have been concerning
she could not have been concerning
we could not have been concerning
you could not have been concerning
they could not have been concerning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I concern?
could you concern?
could she concern?
could we concern?
could you concern?
could they concern? 	could I be concerning?
could you be concerning?
could she be concerning?
could we be concerning?
could you be concerning?
could they be concerning? 	could I have concerned?
could you have concerned?
could she have concerned?
could we have concerned?
could you have concerned?
could they have concerned? 	could I have been concerning?
could you have been concerning?
could she have been concerning?
could we have been concerning?
could you have been concerning?
could they have been concerning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not concern?
could you not concern?
could she not concern?
could we not concern?
could you not concern?
could they not concern? 	could I not be concerning?
could you not be concerning?
could she not be concerning?
could we not be concerning?
could you not be concerning?
could they not be concerning? 	could I not have concerned?
could you not have concerned?
could she not have concerned?
could we not have concerned?
could you not have concerned?
could they not have concerned? 	could I not have been concerning?
could you not have been concerning?
could she not have been concerning?
could we not have been concerning?
could you not have been concerning?
could they not have been concerning?