English verb conjugation COULD PERDURE

Regular verb: perdure - perdured - perdured

Affirmation

Simple form

I could perdure
you could perdure
he could perdure
we could perdure
you could perdure
they could perdure

V-ing form

I could be perduring
you could be perduring
he could be perduring
we could be perduring
you could be perduring
they could be perduring

Perfect

I could have perdured
you could have perdured
he could have perdured
we could have perdured
you could have perdured
they could have perdured

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

I couldn't have been perduring
you couldn't have been perduring
he couldn't have been perduring
we couldn't have been perduring
you couldn't have been perduring
they couldn't have been perduring

Interrogative form

Simple form

could I perdure?
could you perdure?
could he perdure?
could we perdure?
could you perdure?
could they perdure?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

couldn't I perdure?
couldn't you perdure?
couldn't he perdure?
couldn't we perdure?
couldn't you perdure?
couldn't they perdure?

V-ing form

couldn't I be perduring?
couldn't you be perduring?
couldn't he be perduring?
couldn't we be perduring?
couldn't you be perduring?
couldn't they be perduring?

Perfect

couldn't I have perdured?
couldn't you have perdured?
couldn't he have perdured?
couldn't we have perdured?
couldn't you have perdured?
couldn't they have perdured?

V-ing perfect

couldn't I have been perduring?
couldn't you have been perduring?
couldn't he have been perduring?
couldn't we have been perduring?
couldn't you have been perduring?
couldn't they have been perduring?

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