Conjugación del verbo inglés COULD STIFFEN
Verbo regular: stiffen - stiffened - stiffened
Afirmación
Forma simple
I could stiffenyou could stiffen
he could stiffen
we could stiffen
you could stiffen
they could stiffen
Forma con V-ing
I could be stiffeningyou could be stiffening
he could be stiffening
we could be stiffening
you could be stiffening
they could be stiffening
Perfecto
I could have stiffenedyou could have stiffened
he could have stiffened
we could have stiffened
you could have stiffened
they could have stiffened
Perfecto con V-ing
I could have been stiffeningyou could have been stiffening
he could have been stiffening
we could have been stiffening
you could have been stiffening
they could have been stiffening
Negación
Forma simple
I couldn't stiffenyou couldn't stiffen
he couldn't stiffen
we couldn't stiffen
you couldn't stiffen
they couldn't stiffen
Forma con V-ing
I couldn't be stiffeningyou couldn't be stiffening
he couldn't be stiffening
we couldn't be stiffening
you couldn't be stiffening
they couldn't be stiffening
Perfecto
I couldn't have stiffenedyou couldn't have stiffened
he couldn't have stiffened
we couldn't have stiffened
you couldn't have stiffened
they couldn't have stiffened
Perfecto con V-ing
I couldn't have been stiffeningyou couldn't have been stiffening
he couldn't have been stiffening
we couldn't have been stiffening
you couldn't have been stiffening
they couldn't have been stiffening
Forma interrogativa
Forma simple
could I stiffen?could you stiffen?
could he stiffen?
could we stiffen?
could you stiffen?
could they stiffen?
Forma con V-ing
could I be stiffening?could you be stiffening?
could he be stiffening?
could we be stiffening?
could you be stiffening?
could they be stiffening?
Perfecto
could I have stiffened?could you have stiffened?
could he have stiffened?
could we have stiffened?
could you have stiffened?
could they have stiffened?
Perfecto con V-ing
could I have been stiffening?could you have been stiffening?
could he have been stiffening?
could we have been stiffening?
could you have been stiffening?
could they have been stiffening?
Forma interro-negativa
Forma simple
couldn't I stiffen?couldn't you stiffen?
couldn't he stiffen?
couldn't we stiffen?
couldn't you stiffen?
couldn't they stiffen?
Forma con V-ing
couldn't I be stiffening?couldn't you be stiffening?
couldn't he be stiffening?
couldn't we be stiffening?
couldn't you be stiffening?
couldn't they be stiffening?
Perfecto
couldn't I have stiffened?couldn't you have stiffened?
couldn't he have stiffened?
couldn't we have stiffened?
couldn't you have stiffened?
couldn't they have stiffened?
Perfecto con V-ing
couldn't I have been stiffening?couldn't you have been stiffening?
couldn't he have been stiffening?
couldn't we have been stiffening?
couldn't you have been stiffening?
couldn't they have been stiffening?