English verb conjugation
COULD AVER

Regular verb: aver - averred - averred

Affirmation

Simple form	V-ing form
I could aver you could aver she could aver we could aver you could aver they could aver	I could be averring you could be averring she could be averring we could be averring you could be averring they could be averring
Perfect	V-ing perfect
I could have averred you could have averred she could have averred we could have averred you could have averred they could have averred	I could have been averring you could have been averring she could have been averring we could have been averring you could have been averring they could have been averring

Negation

Simple form	V-ing form
I couldn't aver you couldn't aver she couldn't aver we couldn't aver you couldn't aver they couldn't aver	I couldn't be averring you couldn't be averring she couldn't be averring we couldn't be averring you couldn't be averring they couldn't be averring
Perfect	V-ing perfect
I couldn't have averred you couldn't have averred she couldn't have averred we couldn't have averred you couldn't have averred they couldn't have averred	I couldn't have been averring you couldn't have been averring she couldn't have been averring we couldn't have been averring you couldn't have been averring they couldn't have been averring

Interrogative form

Simple form	V-ing form
could I aver? could you aver? could she aver? could we aver? could you aver? could they aver?	could I be averring? could you be averring? could she be averring? could we be averring? could you be averring? could they be averring?
Perfect	V-ing perfect
could I have averred? could you have averred? could she have averred? could we have averred? could you have averred? could they have averred?	could I have been averring? could you have been averring? could she have been averring? could we have been averring? could you have been averring? could they have been averring?

Interro-negative form

Simple form	V-ing form
couldn't I aver? couldn't you aver? couldn't she aver? couldn't we aver? couldn't you aver? couldn't they aver?	couldn't I be averring? couldn't you be averring? couldn't she be averring? couldn't we be averring? couldn't you be averring? couldn't they be averring?
Perfect	V-ing perfect
couldn't I have averred? couldn't you have averred? couldn't she have averred? couldn't we have averred? couldn't you have averred? couldn't they have averred?	couldn't I have been averring? couldn't you have been averring? couldn't she have been averring? couldn't we have been averring? couldn't you have been averring? couldn't they have been averring?