Conjugación del verbo inglés
COULD CONCERN

Verbo regular: concern - concerned - concerned

Afirmación

Forma simple	Forma con 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
Perfecto	Perfecto con V-ing
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

Negación

Forma simple	Forma con 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
Perfecto	Perfecto con V-ing
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 con 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?
Perfecto	Perfecto con V-ing
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-negativa

Forma simple	Forma con 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?
Perfecto	Perfecto con V-ing
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?