Conjugación del verbo inglés
COULD RETAIN

Verbo regular: retain - retained - retained

Afirmación

Forma simple	Forma con V-ing
I could retain you could retain he could retain we could retain you could retain they could retain	I could be retaining you could be retaining he could be retaining we could be retaining you could be retaining they could be retaining
Perfecto	Perfecto con V-ing
I could have retained you could have retained he could have retained we could have retained you could have retained they could have retained	I could have been retaining you could have been retaining he could have been retaining we could have been retaining you could have been retaining they could have been retaining

Negación

Forma simple	Forma con V-ing
I could not retain you could not retain he could not retain we could not retain you could not retain they could not retain	I could not be retaining you could not be retaining he could not be retaining we could not be retaining you could not be retaining they could not be retaining
Perfecto	Perfecto con V-ing
I could not have retained you could not have retained he could not have retained we could not have retained you could not have retained they could not have retained	I could not have been retaining you could not have been retaining he could not have been retaining we could not have been retaining you could not have been retaining they could not have been retaining

Forma interrogativa

Forma simple	Forma con V-ing
could I retain? could you retain? could he retain? could we retain? could you retain? could they retain?	could I be retaining? could you be retaining? could he be retaining? could we be retaining? could you be retaining? could they be retaining?
Perfecto	Perfecto con V-ing
could I have retained? could you have retained? could he have retained? could we have retained? could you have retained? could they have retained?	could I have been retaining? could you have been retaining? could he have been retaining? could we have been retaining? could you have been retaining? could they have been retaining?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not retain? could you not retain? could he not retain? could we not retain? could you not retain? could they not retain?	could I not be retaining? could you not be retaining? could he not be retaining? could we not be retaining? could you not be retaining? could they not be retaining?
Perfecto	Perfecto con V-ing
could I not have retained? could you not have retained? could he not have retained? could we not have retained? could you not have retained? could they not have retained?	could I not have been retaining? could you not have been retaining? could he not have been retaining? could we not have been retaining? could you not have been retaining? could they not have been retaining?