English verb conjugation
COULD PERDURE

Regular verb: perdure - perdured - perdured

Affirmation

Simple form	V-ing form
I could perdure you could perdure he could perdure we could perdure you could perdure they could perdure	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	V-ing 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	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	V-ing 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	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	V-ing 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	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	V-ing form
could I perdure? could you perdure? could he perdure? could we perdure? could you perdure? could they perdure?	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	V-ing 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?	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	V-ing 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?	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	V-ing 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?	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?