English verb conjugation
COULD YAW

Regular verb: yaw - yawed - yawed

Affirmation

Simple form	V-ing form
I could yaw you could yaw he could yaw we could yaw you could yaw they could yaw	I could be yawing you could be yawing he could be yawing we could be yawing you could be yawing they could be yawing
Perfect	V-ing perfect
I could have yawed you could have yawed he could have yawed we could have yawed you could have yawed they could have yawed	I could have been yawing you could have been yawing he could have been yawing we could have been yawing you could have been yawing they could have been yawing

Negation

Simple form	V-ing form
I could not yaw you could not yaw he could not yaw we could not yaw you could not yaw they could not yaw	I could not be yawing you could not be yawing he could not be yawing we could not be yawing you could not be yawing they could not be yawing
Perfect	V-ing perfect
I could not have yawed you could not have yawed he could not have yawed we could not have yawed you could not have yawed they could not have yawed	I could not have been yawing you could not have been yawing he could not have been yawing we could not have been yawing you could not have been yawing they could not have been yawing

Interrogative form

Simple form	V-ing form
could I yaw? could you yaw? could he yaw? could we yaw? could you yaw? could they yaw?	could I be yawing? could you be yawing? could he be yawing? could we be yawing? could you be yawing? could they be yawing?
Perfect	V-ing perfect
could I have yawed? could you have yawed? could he have yawed? could we have yawed? could you have yawed? could they have yawed?	could I have been yawing? could you have been yawing? could he have been yawing? could we have been yawing? could you have been yawing? could they have been yawing?

Interro-negative form

Simple form	V-ing form
could I not yaw? could you not yaw? could he not yaw? could we not yaw? could you not yaw? could they not yaw?	could I not be yawing? could you not be yawing? could he not be yawing? could we not be yawing? could you not be yawing? could they not be yawing?
Perfect	V-ing perfect
could I not have yawed? could you not have yawed? could he not have yawed? could we not have yawed? could you not have yawed? could they not have yawed?	could I not have been yawing? could you not have been yawing? could he not have been yawing? could we not have been yawing? could you not have been yawing? could they not have been yawing?