English verb conjugation
COULD ATTEND

Regular verb: attend - attended - attended

Affirmation

Simple form	V-ing form
I could attend you could attend he could attend we could attend you could attend they could attend	I could be attending you could be attending he could be attending we could be attending you could be attending they could be attending
Perfect	V-ing perfect
I could have attended you could have attended he could have attended we could have attended you could have attended they could have attended	I could have been attending you could have been attending he could have been attending we could have been attending you could have been attending they could have been attending

Negation

Simple form	V-ing form
I couldn't attend you couldn't attend he couldn't attend we couldn't attend you couldn't attend they couldn't attend	I couldn't be attending you couldn't be attending he couldn't be attending we couldn't be attending you couldn't be attending they couldn't be attending
Perfect	V-ing perfect
I couldn't have attended you couldn't have attended he couldn't have attended we couldn't have attended you couldn't have attended they couldn't have attended	I couldn't have been attending you couldn't have been attending he couldn't have been attending we couldn't have been attending you couldn't have been attending they couldn't have been attending

Interrogative form

Simple form	V-ing form
could I attend? could you attend? could he attend? could we attend? could you attend? could they attend?	could I be attending? could you be attending? could he be attending? could we be attending? could you be attending? could they be attending?
Perfect	V-ing perfect
could I have attended? could you have attended? could he have attended? could we have attended? could you have attended? could they have attended?	could I have been attending? could you have been attending? could he have been attending? could we have been attending? could you have been attending? could they have been attending?

Interro-negative form

Simple form	V-ing form
couldn't I attend? couldn't you attend? couldn't he attend? couldn't we attend? couldn't you attend? couldn't they attend?	couldn't I be attending? couldn't you be attending? couldn't he be attending? couldn't we be attending? couldn't you be attending? couldn't they be attending?
Perfect	V-ing perfect
couldn't I have attended? couldn't you have attended? couldn't he have attended? couldn't we have attended? couldn't you have attended? couldn't they have attended?	couldn't I have been attending? couldn't you have been attending? couldn't he have been attending? couldn't we have been attending? couldn't you have been attending? couldn't they have been attending?