English verb conjugation
COULD YAWP

Regular verb: yawp - yawped - yawped

Affirmation

Simple form	V-ing form
I could yawp you could yawp she could yawp we could yawp you could yawp they could yawp	I could be yawping you could be yawping she could be yawping we could be yawping you could be yawping they could be yawping
Perfect	V-ing perfect
I could have yawped you could have yawped she could have yawped we could have yawped you could have yawped they could have yawped	I could have been yawping you could have been yawping she could have been yawping we could have been yawping you could have been yawping they could have been yawping

Negation

Simple form	V-ing form
I could not yawp you could not yawp she could not yawp we could not yawp you could not yawp they could not yawp	I could not be yawping you could not be yawping she could not be yawping we could not be yawping you could not be yawping they could not be yawping
Perfect	V-ing perfect
I could not have yawped you could not have yawped she could not have yawped we could not have yawped you could not have yawped they could not have yawped	I could not have been yawping you could not have been yawping she could not have been yawping we could not have been yawping you could not have been yawping they could not have been yawping

Interrogative form

Simple form	V-ing form
could I yawp? could you yawp? could she yawp? could we yawp? could you yawp? could they yawp?	could I be yawping? could you be yawping? could she be yawping? could we be yawping? could you be yawping? could they be yawping?
Perfect	V-ing perfect
could I have yawped? could you have yawped? could she have yawped? could we have yawped? could you have yawped? could they have yawped?	could I have been yawping? could you have been yawping? could she have been yawping? could we have been yawping? could you have been yawping? could they have been yawping?

Interro-negative form

Simple form	V-ing form
could I not yawp? could you not yawp? could she not yawp? could we not yawp? could you not yawp? could they not yawp?	could I not be yawping? could you not be yawping? could she not be yawping? could we not be yawping? could you not be yawping? could they not be yawping?
Perfect	V-ing perfect
could I not have yawped? could you not have yawped? could she not have yawped? could we not have yawped? could you not have yawped? could they not have yawped?	could I not have been yawping? could you not have been yawping? could she not have been yawping? could we not have been yawping? could you not have been yawping? could they not have been yawping?