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 mustn't furl you mustn't furl he mustn't furl we mustn't furl you mustn't furl they mustn't furl	I mustn't be furling you mustn't be furling he mustn't be furling we mustn't be furling you mustn't be furling they mustn't be furling
Perfect	V-ing perfect
I mustn't have furled you mustn't have furled he mustn't have furled we mustn't have furled you mustn't have furled they mustn't have furled	I mustn't have been furling you mustn't have been furling he mustn't have been furling we mustn't have been furling you mustn't have been furling they mustn't 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
mustn't I furl? mustn't you furl? mustn't he furl? mustn't we furl? mustn't you furl? mustn't they furl?	mustn't I be furling? mustn't you be furling? mustn't he be furling? mustn't we be furling? mustn't you be furling? mustn't they be furling?
Perfect	V-ing perfect
mustn't I have furled? mustn't you have furled? mustn't he have furled? mustn't we have furled? mustn't you have furled? mustn't they have furled?	mustn't I have been furling? mustn't you have been furling? mustn't he have been furling? mustn't we have been furling? mustn't you have been furling? mustn't they have been furling?