English verb conjugation
MUST FURBISH

Regular verb: furbish - furbished - furbished

Affirmation

Simple form	V-ing form
I must furbish you must furbish he must furbish we must furbish you must furbish they must furbish	I must be furbishing you must be furbishing he must be furbishing we must be furbishing you must be furbishing they must be furbishing
Perfect	V-ing perfect
I must have furbished you must have furbished he must have furbished we must have furbished you must have furbished they must have furbished	I must have been furbishing you must have been furbishing he must have been furbishing we must have been furbishing you must have been furbishing they must have been furbishing

Negation

Simple form	V-ing form
I must not furbish you must not furbish he must not furbish we must not furbish you must not furbish they must not furbish	I must not be furbishing you must not be furbishing he must not be furbishing we must not be furbishing you must not be furbishing they must not be furbishing
Perfect	V-ing perfect
I must not have furbished you must not have furbished he must not have furbished we must not have furbished you must not have furbished they must not have furbished	I must not have been furbishing you must not have been furbishing he must not have been furbishing we must not have been furbishing you must not have been furbishing they must not have been furbishing

Interrogative form

Simple form	V-ing form
must I furbish? must you furbish? must he furbish? must we furbish? must you furbish? must they furbish?	must I be furbishing? must you be furbishing? must he be furbishing? must we be furbishing? must you be furbishing? must they be furbishing?
Perfect	V-ing perfect
must I have furbished? must you have furbished? must he have furbished? must we have furbished? must you have furbished? must they have furbished?	must I have been furbishing? must you have been furbishing? must he have been furbishing? must we have been furbishing? must you have been furbishing? must they have been furbishing?

Interro-negative form

Simple form	V-ing form
must I not furbish? must you not furbish? must he not furbish? must we not furbish? must you not furbish? must they not furbish?	must I not be furbishing? must you not be furbishing? must he not be furbishing? must we not be furbishing? must you not be furbishing? must they not be furbishing?
Perfect	V-ing perfect
must I not have furbished? must you not have furbished? must he not have furbished? must we not have furbished? must you not have furbished? must they not have furbished?	must I not have been furbishing? must you not have been furbishing? must he not have been furbishing? must we not have been furbishing? must you not have been furbishing? must they not have been furbishing?