English verb conjugation
MUST YAW

Regular verb: yaw - yawed - yawed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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