Conjugación del verbo inglés
COULD CONCERN

Verbo regular: concern - concerned - concerned

Afirmación

Forma simple	Forma con V-ing
I could concern you could concern he could concern we could concern you could concern they could concern	I could be concerning you could be concerning he 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 he 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 he 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 couldn't concern you couldn't concern he couldn't concern we couldn't concern you couldn't concern they couldn't concern	I couldn't be concerning you couldn't be concerning he couldn't be concerning we couldn't be concerning you couldn't be concerning they couldn't be concerning
Perfecto	Perfecto con V-ing
I couldn't have concerned you couldn't have concerned he couldn't have concerned we couldn't have concerned you couldn't have concerned they couldn't have concerned	I couldn't have been concerning you couldn't have been concerning he couldn't have been concerning we couldn't have been concerning you couldn't have been concerning they couldn't have been concerning

Forma interrogativa

Forma simple	Forma con V-ing
could I concern? could you concern? could he concern? could we concern? could you concern? could they concern?	could I be concerning? could you be concerning? could he 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 he 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 he 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
couldn't I concern? couldn't you concern? couldn't he concern? couldn't we concern? couldn't you concern? couldn't they concern?	couldn't I be concerning? couldn't you be concerning? couldn't he be concerning? couldn't we be concerning? couldn't you be concerning? couldn't they be concerning?
Perfecto	Perfecto con V-ing
couldn't I have concerned? couldn't you have concerned? couldn't he have concerned? couldn't we have concerned? couldn't you have concerned? couldn't they have concerned?	couldn't I have been concerning? couldn't you have been concerning? couldn't he have been concerning? couldn't we have been concerning? couldn't you have been concerning? couldn't they have been concerning?