English verb conjugation
MUST SHIRK

Regular verb: shirk - shirked - shirked

Affirmation

Simple form	V-ing form
I must shirk you must shirk he must shirk we must shirk you must shirk they must shirk	I must be shirking you must be shirking he must be shirking we must be shirking you must be shirking they must be shirking
Perfect	V-ing perfect
I must have shirked you must have shirked he must have shirked we must have shirked you must have shirked they must have shirked	I must have been shirking you must have been shirking he must have been shirking we must have been shirking you must have been shirking they must have been shirking

Negation

Simple form	V-ing form
I mustn't shirk you mustn't shirk he mustn't shirk we mustn't shirk you mustn't shirk they mustn't shirk	I mustn't be shirking you mustn't be shirking he mustn't be shirking we mustn't be shirking you mustn't be shirking they mustn't be shirking
Perfect	V-ing perfect
I mustn't have shirked you mustn't have shirked he mustn't have shirked we mustn't have shirked you mustn't have shirked they mustn't have shirked	I mustn't have been shirking you mustn't have been shirking he mustn't have been shirking we mustn't have been shirking you mustn't have been shirking they mustn't have been shirking

Interrogative form

Simple form	V-ing form
must I shirk? must you shirk? must he shirk? must we shirk? must you shirk? must they shirk?	must I be shirking? must you be shirking? must he be shirking? must we be shirking? must you be shirking? must they be shirking?
Perfect	V-ing perfect
must I have shirked? must you have shirked? must he have shirked? must we have shirked? must you have shirked? must they have shirked?	must I have been shirking? must you have been shirking? must he have been shirking? must we have been shirking? must you have been shirking? must they have been shirking?

Interro-negative form

Simple form	V-ing form
mustn't I shirk? mustn't you shirk? mustn't he shirk? mustn't we shirk? mustn't you shirk? mustn't they shirk?	mustn't I be shirking? mustn't you be shirking? mustn't he be shirking? mustn't we be shirking? mustn't you be shirking? mustn't they be shirking?
Perfect	V-ing perfect
mustn't I have shirked? mustn't you have shirked? mustn't he have shirked? mustn't we have shirked? mustn't you have shirked? mustn't they have shirked?	mustn't I have been shirking? mustn't you have been shirking? mustn't he have been shirking? mustn't we have been shirking? mustn't you have been shirking? mustn't they have been shirking?