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 must not lurk you must not lurk he must not lurk we must not lurk you must not lurk they must not lurk	I must not be lurking you must not be lurking he must not be lurking we must not be lurking you must not be lurking they must not be lurking
Perfect	V-ing perfect
I must not have lurked you must not have lurked he must not have lurked we must not have lurked you must not have lurked they must not have lurked	I must not have been lurking you must not have been lurking he must not have been lurking we must not have been lurking you must not have been lurking they must not 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
must I not lurk? must you not lurk? must he not lurk? must we not lurk? must you not lurk? must they not lurk?	must I not be lurking? must you not be lurking? must he not be lurking? must we not be lurking? must you not be lurking? must they not be lurking?
Perfect	V-ing perfect
must I not have lurked? must you not have lurked? must he not have lurked? must we not have lurked? must you not have lurked? must they not have lurked?	must I not have been lurking? must you not have been lurking? must he not have been lurking? must we not have been lurking? must you not have been lurking? must they not have been lurking?