English verb conjugation
COULD ENDOW

Regular verb: endow - endowed - endowed

Affirmation

Simple form	V-ing form
I could endow you could endow he could endow we could endow you could endow they could endow	I could be endowing you could be endowing he could be endowing we could be endowing you could be endowing they could be endowing
Perfect	V-ing perfect
I could have endowed you could have endowed he could have endowed we could have endowed you could have endowed they could have endowed	I could have been endowing you could have been endowing he could have been endowing we could have been endowing you could have been endowing they could have been endowing

Negation

Simple form	V-ing form
I couldn't endow you couldn't endow he couldn't endow we couldn't endow you couldn't endow they couldn't endow	I couldn't be endowing you couldn't be endowing he couldn't be endowing we couldn't be endowing you couldn't be endowing they couldn't be endowing
Perfect	V-ing perfect
I couldn't have endowed you couldn't have endowed he couldn't have endowed we couldn't have endowed you couldn't have endowed they couldn't have endowed	I couldn't have been endowing you couldn't have been endowing he couldn't have been endowing we couldn't have been endowing you couldn't have been endowing they couldn't have been endowing

Interrogative form

Simple form	V-ing form
could I endow? could you endow? could he endow? could we endow? could you endow? could they endow?	could I be endowing? could you be endowing? could he be endowing? could we be endowing? could you be endowing? could they be endowing?
Perfect	V-ing perfect
could I have endowed? could you have endowed? could he have endowed? could we have endowed? could you have endowed? could they have endowed?	could I have been endowing? could you have been endowing? could he have been endowing? could we have been endowing? could you have been endowing? could they have been endowing?

Interro-negative form

Simple form	V-ing form
couldn't I endow? couldn't you endow? couldn't he endow? couldn't we endow? couldn't you endow? couldn't they endow?	couldn't I be endowing? couldn't you be endowing? couldn't he be endowing? couldn't we be endowing? couldn't you be endowing? couldn't they be endowing?
Perfect	V-ing perfect
couldn't I have endowed? couldn't you have endowed? couldn't he have endowed? couldn't we have endowed? couldn't you have endowed? couldn't they have endowed?	couldn't I have been endowing? couldn't you have been endowing? couldn't he have been endowing? couldn't we have been endowing? couldn't you have been endowing? couldn't they have been endowing?