English verb conjugation
MUST YAWP

Regular verb: yawp - yawped - yawped

Affirmation

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

Negation

Simple form	V-ing form
I mustn't yawp you mustn't yawp he mustn't yawp we mustn't yawp you mustn't yawp they mustn't yawp	I mustn't be yawping you mustn't be yawping he mustn't be yawping we mustn't be yawping you mustn't be yawping they mustn't be yawping
Perfect	V-ing perfect
I mustn't have yawped you mustn't have yawped he mustn't have yawped we mustn't have yawped you mustn't have yawped they mustn't have yawped	I mustn't have been yawping you mustn't have been yawping he mustn't have been yawping we mustn't have been yawping you mustn't have been yawping they mustn't have been yawping

Interrogative form

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

Interro-negative form

Simple form	V-ing form
mustn't I yawp? mustn't you yawp? mustn't he yawp? mustn't we yawp? mustn't you yawp? mustn't they yawp?	mustn't I be yawping? mustn't you be yawping? mustn't he be yawping? mustn't we be yawping? mustn't you be yawping? mustn't they be yawping?
Perfect	V-ing perfect
mustn't I have yawped? mustn't you have yawped? mustn't he have yawped? mustn't we have yawped? mustn't you have yawped? mustn't they have yawped?	mustn't I have been yawping? mustn't you have been yawping? mustn't he have been yawping? mustn't we have been yawping? mustn't you have been yawping? mustn't they have been yawping?