English verb conjugation
MUST FRILL

Regular verb: frill - frilled - frilled

Affirmation

Simple form	V-ing form
I must frill you must frill he must frill we must frill you must frill they must frill	I must be frilling you must be frilling he must be frilling we must be frilling you must be frilling they must be frilling
Perfect	V-ing perfect
I must have frilled you must have frilled he must have frilled we must have frilled you must have frilled they must have frilled	I must have been frilling you must have been frilling he must have been frilling we must have been frilling you must have been frilling they must have been frilling

Negation

Simple form	V-ing form
I must not frill you must not frill he must not frill we must not frill you must not frill they must not frill	I must not be frilling you must not be frilling he must not be frilling we must not be frilling you must not be frilling they must not be frilling
Perfect	V-ing perfect
I must not have frilled you must not have frilled he must not have frilled we must not have frilled you must not have frilled they must not have frilled	I must not have been frilling you must not have been frilling he must not have been frilling we must not have been frilling you must not have been frilling they must not have been frilling

Interrogative form

Simple form	V-ing form
must I frill? must you frill? must he frill? must we frill? must you frill? must they frill?	must I be frilling? must you be frilling? must he be frilling? must we be frilling? must you be frilling? must they be frilling?
Perfect	V-ing perfect
must I have frilled? must you have frilled? must he have frilled? must we have frilled? must you have frilled? must they have frilled?	must I have been frilling? must you have been frilling? must he have been frilling? must we have been frilling? must you have been frilling? must they have been frilling?

Interro-negative form

Simple form	V-ing form
must I not frill? must you not frill? must he not frill? must we not frill? must you not frill? must they not frill?	must I not be frilling? must you not be frilling? must he not be frilling? must we not be frilling? must you not be frilling? must they not be frilling?
Perfect	V-ing perfect
must I not have frilled? must you not have frilled? must he not have frilled? must we not have frilled? must you not have frilled? must they not have frilled?	must I not have been frilling? must you not have been frilling? must he not have been frilling? must we not have been frilling? must you not have been frilling? must they not have been frilling?