Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could endure endure you could endure endure she could endure endure we could endure endure you could endure endure they could endure endure
V-ing form
I could be endure enduring you could be endure enduring she could be endure enduring we could be endure enduring you could be endure enduring they could be endure enduring
Perfect
I could have endure endured you could have endure endured she could have endure endured we could have endure endured you could have endure endured they could have endure endured
V-ing perfect
I could have been endure enduring you could have been endure enduring she could have been endure enduring we could have been endure enduring you could have been endure enduring they could have been endure enduring
Negation
Simple form
I couldn't endure endure you couldn't endure endure she couldn't endure endure we couldn't endure endure you couldn't endure endure they couldn't endure endure
V-ing form
I couldn't be endure enduring you couldn't be endure enduring she couldn't be endure enduring we couldn't be endure enduring you couldn't be endure enduring they couldn't be endure enduring
Perfect
I couldn't have endure endured you couldn't have endure endured she couldn't have endure endured we couldn't have endure endured you couldn't have endure endured they couldn't have endure endured
V-ing perfect
I couldn't have been endure enduring you couldn't have been endure enduring she couldn't have been endure enduring we couldn't have been endure enduring you couldn't have been endure enduring they couldn't have been endure enduring
Interrogative form
Simple form
could I endure endure? could you endure endure? could she endure endure? could we endure endure? could you endure endure? could they endure endure?
V-ing form
could I be endure enduring? could you be endure enduring? could she be endure enduring? could we be endure enduring? could you be endure enduring? could they be endure enduring?
Perfect
could I have endure endured? could you have endure endured? could she have endure endured? could we have endure endured? could you have endure endured? could they have endure endured?
V-ing perfect
could I have been endure enduring? could you have been endure enduring? could she have been endure enduring? could we have been endure enduring? could you have been endure enduring? could they have been endure enduring?
Interro-negative form
Simple form
couldn't I endure endure? couldn't you endure endure? couldn't she endure endure? couldn't we endure endure? couldn't you endure endure? couldn't they endure endure?
V-ing form
couldn't I be endure enduring? couldn't you be endure enduring? couldn't she be endure enduring? couldn't we be endure enduring? couldn't you be endure enduring? couldn't they be endure enduring?
Perfect
couldn't I have endure endured? couldn't you have endure endured? couldn't she have endure endured? couldn't we have endure endured? couldn't you have endure endured? couldn't they have endure endured?
V-ing perfect
couldn't I have been endure enduring? couldn't you have been endure enduring? couldn't she have been endure enduring? couldn't we have been endure enduring? couldn't you have been endure enduring? couldn't they have been endure enduring?