English verb conjugation
MUST FURL

Regular verb: furl - furled - furled

Affirmation

Simple form	V-ing form
I must furl you must furl she must furl we must furl you must furl they must furl	I must be furling you must be furling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she furl? must we furl? must you furl? must they furl?	must I be furling? must you be furling? must she 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 she 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 she 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 she 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 she 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 she 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 she have been furling? mustn't we have been furling? mustn't you have been furling? mustn't they have been furling?