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 mustn't furbish you mustn't furbish he mustn't furbish we mustn't furbish you mustn't furbish they mustn't furbish	I mustn't be furbishing you mustn't be furbishing he mustn't be furbishing we mustn't be furbishing you mustn't be furbishing they mustn't be furbishing
Perfect	V-ing perfect
I mustn't have furbished you mustn't have furbished he mustn't have furbished we mustn't have furbished you mustn't have furbished they mustn't have furbished	I mustn't have been furbishing you mustn't have been furbishing he mustn't have been furbishing we mustn't have been furbishing you mustn't have been furbishing they mustn't 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
mustn't I furbish? mustn't you furbish? mustn't he furbish? mustn't we furbish? mustn't you furbish? mustn't they furbish?	mustn't I be furbishing? mustn't you be furbishing? mustn't he be furbishing? mustn't we be furbishing? mustn't you be furbishing? mustn't they be furbishing?
Perfect	V-ing perfect
mustn't I have furbished? mustn't you have furbished? mustn't he have furbished? mustn't we have furbished? mustn't you have furbished? mustn't they have furbished?	mustn't I have been furbishing? mustn't you have been furbishing? mustn't he have been furbishing? mustn't we have been furbishing? mustn't you have been furbishing? mustn't they have been furbishing?