English verb conjugation
MUST FUR

Regular verb: fur - furred - furred

Affirmation

Simple form	V-ing form
I must fur you must fur she must fur we must fur you must fur they must fur	I must be furring you must be furring she must be furring we must be furring you must be furring they must be furring
Perfect	V-ing perfect
I must have furred you must have furred she must have furred we must have furred you must have furred they must have furred	I must have been furring you must have been furring she must have been furring we must have been furring you must have been furring they must have been furring

Negation

Simple form	V-ing form
I must not fur you must not fur she must not fur we must not fur you must not fur they must not fur	I must not be furring you must not be furring she must not be furring we must not be furring you must not be furring they must not be furring
Perfect	V-ing perfect
I must not have furred you must not have furred she must not have furred we must not have furred you must not have furred they must not have furred	I must not have been furring you must not have been furring she must not have been furring we must not have been furring you must not have been furring they must not have been furring

Interrogative form

Simple form	V-ing form
must I fur? must you fur? must she fur? must we fur? must you fur? must they fur?	must I be furring? must you be furring? must she be furring? must we be furring? must you be furring? must they be furring?
Perfect	V-ing perfect
must I have furred? must you have furred? must she have furred? must we have furred? must you have furred? must they have furred?	must I have been furring? must you have been furring? must she have been furring? must we have been furring? must you have been furring? must they have been furring?

Interro-negative form

Simple form	V-ing form
must I not fur? must you not fur? must she not fur? must we not fur? must you not fur? must they not fur?	must I not be furring? must you not be furring? must she not be furring? must we not be furring? must you not be furring? must they not be furring?
Perfect	V-ing perfect
must I not have furred? must you not have furred? must she not have furred? must we not have furred? must you not have furred? must they not have furred?	must I not have been furring? must you not have been furring? must she not have been furring? must we not have been furring? must you not have been furring? must they not have been furring?