English verb conjugation
MUST LISP

Regular verb: lisp - lisped - lisped

Affirmation

Simple form	V-ing form
I must lisp you must lisp he must lisp we must lisp you must lisp they must lisp	I must be lisping you must be lisping he must be lisping we must be lisping you must be lisping they must be lisping
Perfect	V-ing perfect
I must have lisped you must have lisped he must have lisped we must have lisped you must have lisped they must have lisped	I must have been lisping you must have been lisping he must have been lisping we must have been lisping you must have been lisping they must have been lisping

Negation

Simple form	V-ing form
I must not lisp you must not lisp he must not lisp we must not lisp you must not lisp they must not lisp	I must not be lisping you must not be lisping he must not be lisping we must not be lisping you must not be lisping they must not be lisping
Perfect	V-ing perfect
I must not have lisped you must not have lisped he must not have lisped we must not have lisped you must not have lisped they must not have lisped	I must not have been lisping you must not have been lisping he must not have been lisping we must not have been lisping you must not have been lisping they must not have been lisping

Interrogative form

Simple form	V-ing form
must I lisp? must you lisp? must he lisp? must we lisp? must you lisp? must they lisp?	must I be lisping? must you be lisping? must he be lisping? must we be lisping? must you be lisping? must they be lisping?
Perfect	V-ing perfect
must I have lisped? must you have lisped? must he have lisped? must we have lisped? must you have lisped? must they have lisped?	must I have been lisping? must you have been lisping? must he have been lisping? must we have been lisping? must you have been lisping? must they have been lisping?

Interro-negative form

Simple form	V-ing form
must I not lisp? must you not lisp? must he not lisp? must we not lisp? must you not lisp? must they not lisp?	must I not be lisping? must you not be lisping? must he not be lisping? must we not be lisping? must you not be lisping? must they not be lisping?
Perfect	V-ing perfect
must I not have lisped? must you not have lisped? must he not have lisped? must we not have lisped? must you not have lisped? must they not have lisped?	must I not have been lisping? must you not have been lisping? must he not have been lisping? must we not have been lisping? must you not have been lisping? must they not have been lisping?