Conjugação do verbo inglês COULD STIFFEN

Verbo regular: stiffen - stiffened - stiffened

Afirmação

Forma simple

I could stiffen
you could stiffen
he could stiffen
we could stiffen
you could stiffen
they could stiffen

Forma com V-ing

I could be stiffening
you could be stiffening
he could be stiffening
we could be stiffening
you could be stiffening
they could be stiffening

Perfeito

I could have stiffened
you could have stiffened
he could have stiffened
we could have stiffened
you could have stiffened
they could have stiffened

Perfeito com V-ing

I could have been stiffening
you could have been stiffening
he could have been stiffening
we could have been stiffening
you could have been stiffening
they could have been stiffening

Negação

Forma simple

I couldn't stiffen
you couldn't stiffen
he couldn't stiffen
we couldn't stiffen
you couldn't stiffen
they couldn't stiffen

Forma com V-ing

I couldn't be stiffening
you couldn't be stiffening
he couldn't be stiffening
we couldn't be stiffening
you couldn't be stiffening
they couldn't be stiffening

Perfeito

I couldn't have stiffened
you couldn't have stiffened
he couldn't have stiffened
we couldn't have stiffened
you couldn't have stiffened
they couldn't have stiffened

Perfeito com V-ing

I couldn't have been stiffening
you 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 com 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?

Perfeito

could I have stiffened?
could you have stiffened?
could he have stiffened?
could we have stiffened?
could you have stiffened?
could they have stiffened?

Perfeito com 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-Negação

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 com 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?

Perfeito

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?

Perfeito com 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?

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