English verb conjugation
MUST SILK

Regular verb: silk - silked - silked

Affirmation

Simple form	V-ing form
I must silk you must silk he must silk we must silk you must silk they must silk	I must be silking you must be silking he must be silking we must be silking you must be silking they must be silking
Perfect	V-ing perfect
I must have silked you must have silked he must have silked we must have silked you must have silked they must have silked	I must have been silking you must have been silking he must have been silking we must have been silking you must have been silking they must have been silking

Negation

Simple form	V-ing form
I mustn't silk you mustn't silk he mustn't silk we mustn't silk you mustn't silk they mustn't silk	I mustn't be silking you mustn't be silking he mustn't be silking we mustn't be silking you mustn't be silking they mustn't be silking
Perfect	V-ing perfect
I mustn't have silked you mustn't have silked he mustn't have silked we mustn't have silked you mustn't have silked they mustn't have silked	I mustn't have been silking you mustn't have been silking he mustn't have been silking we mustn't have been silking you mustn't have been silking they mustn't have been silking

Interrogative form

Simple form	V-ing form
must I silk? must you silk? must he silk? must we silk? must you silk? must they silk?	must I be silking? must you be silking? must he be silking? must we be silking? must you be silking? must they be silking?
Perfect	V-ing perfect
must I have silked? must you have silked? must he have silked? must we have silked? must you have silked? must they have silked?	must I have been silking? must you have been silking? must he have been silking? must we have been silking? must you have been silking? must they have been silking?

Interro-negative form

Simple form	V-ing form
mustn't I silk? mustn't you silk? mustn't he silk? mustn't we silk? mustn't you silk? mustn't they silk?	mustn't I be silking? mustn't you be silking? mustn't he be silking? mustn't we be silking? mustn't you be silking? mustn't they be silking?
Perfect	V-ing perfect
mustn't I have silked? mustn't you have silked? mustn't he have silked? mustn't we have silked? mustn't you have silked? mustn't they have silked?	mustn't I have been silking? mustn't you have been silking? mustn't he have been silking? mustn't we have been silking? mustn't you have been silking? mustn't they have been silking?