English verb conjugation
MUST BUSK

Regular verb: busk - busked - busked

Affirmation

Simple form	V-ing form
I must busk you must busk he must busk we must busk you must busk they must busk	I must be busking you must be busking he must be busking we must be busking you must be busking they must be busking
Perfect	V-ing perfect
I must have busked you must have busked he must have busked we must have busked you must have busked they must have busked	I must have been busking you must have been busking he must have been busking we must have been busking you must have been busking they must have been busking

Negation

Simple form	V-ing form
I must not busk you must not busk he must not busk we must not busk you must not busk they must not busk	I must not be busking you must not be busking he must not be busking we must not be busking you must not be busking they must not be busking
Perfect	V-ing perfect
I must not have busked you must not have busked he must not have busked we must not have busked you must not have busked they must not have busked	I must not have been busking you must not have been busking he must not have been busking we must not have been busking you must not have been busking they must not have been busking

Interrogative form

Simple form	V-ing form
must I busk? must you busk? must he busk? must we busk? must you busk? must they busk?	must I be busking? must you be busking? must he be busking? must we be busking? must you be busking? must they be busking?
Perfect	V-ing perfect
must I have busked? must you have busked? must he have busked? must we have busked? must you have busked? must they have busked?	must I have been busking? must you have been busking? must he have been busking? must we have been busking? must you have been busking? must they have been busking?

Interro-negative form

Simple form	V-ing form
must I not busk? must you not busk? must he not busk? must we not busk? must you not busk? must they not busk?	must I not be busking? must you not be busking? must he not be busking? must we not be busking? must you not be busking? must they not be busking?
Perfect	V-ing perfect
must I not have busked? must you not have busked? must he not have busked? must we not have busked? must you not have busked? must they not have busked?	must I not have been busking? must you not have been busking? must he not have been busking? must we not have been busking? must you not have been busking? must they not have been busking?