English verb conjugation COULD STIFF

Regular verb: stiff - stiffed - stiffed

Affirmation

Simple form

I could stiff
you could stiff
he could stiff
we could stiff
you could stiff
they could stiff

V-ing form

I could be stiffing
you could be stiffing
he could be stiffing
we could be stiffing
you could be stiffing
they could be stiffing

Perfect

I could have stiffed
you could have stiffed
he could have stiffed
we could have stiffed
you could have stiffed
they could have stiffed

V-ing perfect

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

Negation

Simple form

I could not stiff
you could not stiff
he could not stiff
we could not stiff
you could not stiff
they could not stiff

V-ing form

I could not be stiffing
you could not be stiffing
he could not be stiffing
we could not be stiffing
you could not be stiffing
they could not be stiffing

Perfect

I could not have stiffed
you could not have stiffed
he could not have stiffed
we could not have stiffed
you could not have stiffed
they could not have stiffed

V-ing perfect

I could not have been stiffing
you could not have been stiffing
he could not have been stiffing
we could not have been stiffing
you could not have been stiffing
they could not have been stiffing

Interrogative form

Simple form

could I stiff?
could you stiff?
could he stiff?
could we stiff?
could you stiff?
could they stiff?

V-ing form

could I be stiffing?
could you be stiffing?
could he be stiffing?
could we be stiffing?
could you be stiffing?
could they be stiffing?

Perfect

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

V-ing perfect

could I have been stiffing?
could you have been stiffing?
could he have been stiffing?
could we have been stiffing?
could you have been stiffing?
could they have been stiffing?

Interro-negative form

Simple form

could I not stiff?
could you not stiff?
could he not stiff?
could we not stiff?
could you not stiff?
could they not stiff?

V-ing form

could I not be stiffing?
could you not be stiffing?
could he not be stiffing?
could we not be stiffing?
could you not be stiffing?
could they not be stiffing?

Perfect

could I not have stiffed?
could you not have stiffed?
could he not have stiffed?
could we not have stiffed?
could you not have stiffed?
could they not have stiffed?

V-ing perfect

could I not have been stiffing?
could you not have been stiffing?
could he not have been stiffing?
could we not have been stiffing?
could you not have been stiffing?
could they not have been stiffing?

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