English verb conjugation
MUST CORK

Regular verb: cork - corked - corked

Affirmation

Simple form	V-ing form
I must cork you must cork he must cork we must cork you must cork they must cork	I must be corking you must be corking he must be corking we must be corking you must be corking they must be corking
Perfect	V-ing perfect
I must have corked you must have corked he must have corked we must have corked you must have corked they must have corked	I must have been corking you must have been corking he must have been corking we must have been corking you must have been corking they must have been corking

Negation

Simple form	V-ing form
I must not cork you must not cork he must not cork we must not cork you must not cork they must not cork	I must not be corking you must not be corking he must not be corking we must not be corking you must not be corking they must not be corking
Perfect	V-ing perfect
I must not have corked you must not have corked he must not have corked we must not have corked you must not have corked they must not have corked	I must not have been corking you must not have been corking he must not have been corking we must not have been corking you must not have been corking they must not have been corking

Interrogative form

Simple form	V-ing form
must I cork? must you cork? must he cork? must we cork? must you cork? must they cork?	must I be corking? must you be corking? must he be corking? must we be corking? must you be corking? must they be corking?
Perfect	V-ing perfect
must I have corked? must you have corked? must he have corked? must we have corked? must you have corked? must they have corked?	must I have been corking? must you have been corking? must he have been corking? must we have been corking? must you have been corking? must they have been corking?

Interro-negative form

Simple form	V-ing form
must I not cork? must you not cork? must he not cork? must we not cork? must you not cork? must they not cork?	must I not be corking? must you not be corking? must he not be corking? must we not be corking? must you not be corking? must they not be corking?
Perfect	V-ing perfect
must I not have corked? must you not have corked? must he not have corked? must we not have corked? must you not have corked? must they not have corked?	must I not have been corking? must you not have been corking? must he not have been corking? must we not have been corking? must you not have been corking? must they not have been corking?