English verb conjugation
MUST CORK

Regular verb: cork - corked - corked

Affirmation

Simple form	V-ing form
I must cork you must cork she must cork we must cork you must cork they must cork	I must be corking you must be corking she 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 she 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 she 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 mustn't cork you mustn't cork she mustn't cork we mustn't cork you mustn't cork they mustn't cork	I mustn't be corking you mustn't be corking she mustn't be corking we mustn't be corking you mustn't be corking they mustn't be corking
Perfect	V-ing perfect
I mustn't have corked you mustn't have corked she mustn't have corked we mustn't have corked you mustn't have corked they mustn't have corked	I mustn't have been corking you mustn't have been corking she mustn't have been corking we mustn't have been corking you mustn't have been corking they mustn't have been corking

Interrogative form

Simple form	V-ing form
must I cork? must you cork? must she cork? must we cork? must you cork? must they cork?	must I be corking? must you be corking? must she 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 she 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 she 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
mustn't I cork? mustn't you cork? mustn't she cork? mustn't we cork? mustn't you cork? mustn't they cork?	mustn't I be corking? mustn't you be corking? mustn't she be corking? mustn't we be corking? mustn't you be corking? mustn't they be corking?
Perfect	V-ing perfect
mustn't I have corked? mustn't you have corked? mustn't she have corked? mustn't we have corked? mustn't you have corked? mustn't they have corked?	mustn't I have been corking? mustn't you have been corking? mustn't she have been corking? mustn't we have been corking? mustn't you have been corking? mustn't they have been corking?