English verb conjugation
MUST LURK

Regular verb: lurk - lurked - lurked

Affirmation

Simple form	V-ing form
I must lurk you must lurk he must lurk we must lurk you must lurk they must lurk	I must be lurking you must be lurking he must be lurking we must be lurking you must be lurking they must be lurking
Perfect	V-ing perfect
I must have lurked you must have lurked he must have lurked we must have lurked you must have lurked they must have lurked	I must have been lurking you must have been lurking he must have been lurking we must have been lurking you must have been lurking they must have been lurking

Negation

Simple form	V-ing form
I mustn't lurk you mustn't lurk he mustn't lurk we mustn't lurk you mustn't lurk they mustn't lurk	I mustn't be lurking you mustn't be lurking he mustn't be lurking we mustn't be lurking you mustn't be lurking they mustn't be lurking
Perfect	V-ing perfect
I mustn't have lurked you mustn't have lurked he mustn't have lurked we mustn't have lurked you mustn't have lurked they mustn't have lurked	I mustn't have been lurking you mustn't have been lurking he mustn't have been lurking we mustn't have been lurking you mustn't have been lurking they mustn't have been lurking

Interrogative form

Simple form	V-ing form
must I lurk? must you lurk? must he lurk? must we lurk? must you lurk? must they lurk?	must I be lurking? must you be lurking? must he be lurking? must we be lurking? must you be lurking? must they be lurking?
Perfect	V-ing perfect
must I have lurked? must you have lurked? must he have lurked? must we have lurked? must you have lurked? must they have lurked?	must I have been lurking? must you have been lurking? must he have been lurking? must we have been lurking? must you have been lurking? must they have been lurking?

Interro-negative form

Simple form	V-ing form
mustn't I lurk? mustn't you lurk? mustn't he lurk? mustn't we lurk? mustn't you lurk? mustn't they lurk?	mustn't I be lurking? mustn't you be lurking? mustn't he be lurking? mustn't we be lurking? mustn't you be lurking? mustn't they be lurking?
Perfect	V-ing perfect
mustn't I have lurked? mustn't you have lurked? mustn't he have lurked? mustn't we have lurked? mustn't you have lurked? mustn't they have lurked?	mustn't I have been lurking? mustn't you have been lurking? mustn't he have been lurking? mustn't we have been lurking? mustn't you have been lurking? mustn't they have been lurking?