English verb conjugation
MUST FURL

Regular verb: furl - furled - furled

Affirmation

Simple form	V-ing form
I must furl you must furl he must furl we must furl you must furl they must furl	I must be furling you must be furling he must be furling we must be furling you must be furling they must be furling
Perfect	V-ing perfect
I must have furled you must have furled he must have furled we must have furled you must have furled they must have furled	I must have been furling you must have been furling he must have been furling we must have been furling you must have been furling they must have been furling

Negation

Simple form	V-ing form
I must not furl you must not furl he must not furl we must not furl you must not furl they must not furl	I must not be furling you must not be furling he must not be furling we must not be furling you must not be furling they must not be furling
Perfect	V-ing perfect
I must not have furled you must not have furled he must not have furled we must not have furled you must not have furled they must not have furled	I must not have been furling you must not have been furling he must not have been furling we must not have been furling you must not have been furling they must not have been furling

Interrogative form

Simple form	V-ing form
must I furl? must you furl? must he furl? must we furl? must you furl? must they furl?	must I be furling? must you be furling? must he be furling? must we be furling? must you be furling? must they be furling?
Perfect	V-ing perfect
must I have furled? must you have furled? must he have furled? must we have furled? must you have furled? must they have furled?	must I have been furling? must you have been furling? must he have been furling? must we have been furling? must you have been furling? must they have been furling?

Interro-negative form

Simple form	V-ing form
must I not furl? must you not furl? must he not furl? must we not furl? must you not furl? must they not furl?	must I not be furling? must you not be furling? must he not be furling? must we not be furling? must you not be furling? must they not be furling?
Perfect	V-ing perfect
must I not have furled? must you not have furled? must he not have furled? must we not have furled? must you not have furled? must they not have furled?	must I not have been furling? must you not have been furling? must he not have been furling? must we not have been furling? must you not have been furling? must they not have been furling?