English verb conjugation
MUST WHELP

Regular verb: whelp - whelped - whelped

Affirmation

Simple form	V-ing form
I must whelp you must whelp he must whelp we must whelp you must whelp they must whelp	I must be whelping you must be whelping he must be whelping we must be whelping you must be whelping they must be whelping
Perfect	V-ing perfect
I must have whelped you must have whelped he must have whelped we must have whelped you must have whelped they must have whelped	I must have been whelping you must have been whelping he must have been whelping we must have been whelping you must have been whelping they must have been whelping

Negation

Simple form	V-ing form
I must not whelp you must not whelp he must not whelp we must not whelp you must not whelp they must not whelp	I must not be whelping you must not be whelping he must not be whelping we must not be whelping you must not be whelping they must not be whelping
Perfect	V-ing perfect
I must not have whelped you must not have whelped he must not have whelped we must not have whelped you must not have whelped they must not have whelped	I must not have been whelping you must not have been whelping he must not have been whelping we must not have been whelping you must not have been whelping they must not have been whelping

Interrogative form

Simple form	V-ing form
must I whelp? must you whelp? must he whelp? must we whelp? must you whelp? must they whelp?	must I be whelping? must you be whelping? must he be whelping? must we be whelping? must you be whelping? must they be whelping?
Perfect	V-ing perfect
must I have whelped? must you have whelped? must he have whelped? must we have whelped? must you have whelped? must they have whelped?	must I have been whelping? must you have been whelping? must he have been whelping? must we have been whelping? must you have been whelping? must they have been whelping?

Interro-negative form

Simple form	V-ing form
must I not whelp? must you not whelp? must he not whelp? must we not whelp? must you not whelp? must they not whelp?	must I not be whelping? must you not be whelping? must he not be whelping? must we not be whelping? must you not be whelping? must they not be whelping?
Perfect	V-ing perfect
must I not have whelped? must you not have whelped? must he not have whelped? must we not have whelped? must you not have whelped? must they not have whelped?	must I not have been whelping? must you not have been whelping? must he not have been whelping? must we not have been whelping? must you not have been whelping? must they not have been whelping?