English verb conjugation
MUST SHEAF

Regular verb: sheaf - sheafed - sheafed

Affirmation

Simple form	V-ing form
I must sheaf you must sheaf he must sheaf we must sheaf you must sheaf they must sheaf	I must be sheafing you must be sheafing he must be sheafing we must be sheafing you must be sheafing they must be sheafing
Perfect	V-ing perfect
I must have sheafed you must have sheafed he must have sheafed we must have sheafed you must have sheafed they must have sheafed	I must have been sheafing you must have been sheafing he must have been sheafing we must have been sheafing you must have been sheafing they must have been sheafing

Negation

Simple form	V-ing form
I must not sheaf you must not sheaf he must not sheaf we must not sheaf you must not sheaf they must not sheaf	I must not be sheafing you must not be sheafing he must not be sheafing we must not be sheafing you must not be sheafing they must not be sheafing
Perfect	V-ing perfect
I must not have sheafed you must not have sheafed he must not have sheafed we must not have sheafed you must not have sheafed they must not have sheafed	I must not have been sheafing you must not have been sheafing he must not have been sheafing we must not have been sheafing you must not have been sheafing they must not have been sheafing

Interrogative form

Simple form	V-ing form
must I sheaf? must you sheaf? must he sheaf? must we sheaf? must you sheaf? must they sheaf?	must I be sheafing? must you be sheafing? must he be sheafing? must we be sheafing? must you be sheafing? must they be sheafing?
Perfect	V-ing perfect
must I have sheafed? must you have sheafed? must he have sheafed? must we have sheafed? must you have sheafed? must they have sheafed?	must I have been sheafing? must you have been sheafing? must he have been sheafing? must we have been sheafing? must you have been sheafing? must they have been sheafing?

Interro-negative form

Simple form	V-ing form
must I not sheaf? must you not sheaf? must he not sheaf? must we not sheaf? must you not sheaf? must they not sheaf?	must I not be sheafing? must you not be sheafing? must he not be sheafing? must we not be sheafing? must you not be sheafing? must they not be sheafing?
Perfect	V-ing perfect
must I not have sheafed? must you not have sheafed? must he not have sheafed? must we not have sheafed? must you not have sheafed? must they not have sheafed?	must I not have been sheafing? must you not have been sheafing? must he not have been sheafing? must we not have been sheafing? must you not have been sheafing? must they not have been sheafing?