Conjugación del verbo inglés
CAN CONCERN

Verbo regular: concern - concerned - concerned

Afirmación

Forma simple	Forma con V-ing
I can concern you can concern he can concern we can concern you can concern they can concern	I can be concerning you can be concerning he can be concerning we can be concerning you can be concerning they can be concerning
Perfecto	Perfecto con V-ing
I can have concerned you can have concerned he can have concerned we can have concerned you can have concerned they can have concerned	I can have been concerning you can have been concerning he can have been concerning we can have been concerning you can have been concerning they can have been concerning

Negación

Forma simple	Forma con V-ing
I cannot concern you cannot concern he cannot concern we cannot concern you cannot concern they cannot concern	I cannot be concerning you cannot be concerning he cannot be concerning we cannot be concerning you cannot be concerning they cannot be concerning
Perfecto	Perfecto con V-ing
I cannot have concerned you cannot have concerned he cannot have concerned we cannot have concerned you cannot have concerned they cannot have concerned	I cannot have been concerning you cannot have been concerning he cannot have been concerning we cannot have been concerning you cannot have been concerning they cannot have been concerning

Forma interrogativa

Forma simple	Forma con V-ing
can I concern? can you concern? can he concern? can we concern? can you concern? can they concern?	can I be concerning? can you be concerning? can he be concerning? can we be concerning? can you be concerning? can they be concerning?
Perfecto	Perfecto con V-ing
can I have concerned? can you have concerned? can he have concerned? can we have concerned? can you have concerned? can they have concerned?	can I have been concerning? can you have been concerning? can he have been concerning? can we have been concerning? can you have been concerning? can they have been concerning?

Forma interro-negativa

Forma simple	Forma con V-ing
can I not concern? can you not concern? can he not concern? can we not concern? can you not concern? can they not concern?	can I not be concerning? can you not be concerning? can he not be concerning? can we not be concerning? can you not be concerning? can they not be concerning?
Perfecto	Perfecto con V-ing
can I not have concerned? can you not have concerned? can he not have concerned? can we not have concerned? can you not have concerned? can they not have concerned?	can I not have been concerning? can you not have been concerning? can he not have been concerning? can we not have been concerning? can you not have been concerning? can they not have been concerning?