English verb conjugation COULD PERDURE

Regular verb: perdure - perdured - perdured

Affirmation

Simple form

I could perdure
you could perdure
she could perdure
we could perdure
you could perdure
they could perdure

V-ing form

I could be perduring
you could be perduring
she could be perduring
we could be perduring
you could be perduring
they could be perduring

Perfect

I could have perdured
you could have perdured
she 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
she 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
she 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
she 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
she 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
she 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 she perdure?
could we perdure?
could you perdure?
could they perdure?

V-ing form

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

Perfect

could I have perdured?
could you have perdured?
could she 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 she 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 she 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 she 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 she 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 she 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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