English verb conjugation
MUST FOLD

Regular verb: fold - folded - folded

Affirmation

Simple form	V-ing form
I must fold you must fold she must fold we must fold you must fold they must fold	I must be folding you must be folding she must be folding we must be folding you must be folding they must be folding
Perfect	V-ing perfect
I must have folded you must have folded she must have folded we must have folded you must have folded they must have folded	I must have been folding you must have been folding she must have been folding we must have been folding you must have been folding they must have been folding

Negation

Simple form	V-ing form
I mustn't fold you mustn't fold she mustn't fold we mustn't fold you mustn't fold they mustn't fold	I mustn't be folding you mustn't be folding she mustn't be folding we mustn't be folding you mustn't be folding they mustn't be folding
Perfect	V-ing perfect
I mustn't have folded you mustn't have folded she mustn't have folded we mustn't have folded you mustn't have folded they mustn't have folded	I mustn't have been folding you mustn't have been folding she mustn't have been folding we mustn't have been folding you mustn't have been folding they mustn't have been folding

Interrogative form

Simple form	V-ing form
must I fold? must you fold? must she fold? must we fold? must you fold? must they fold?	must I be folding? must you be folding? must she be folding? must we be folding? must you be folding? must they be folding?
Perfect	V-ing perfect
must I have folded? must you have folded? must she have folded? must we have folded? must you have folded? must they have folded?	must I have been folding? must you have been folding? must she have been folding? must we have been folding? must you have been folding? must they have been folding?

Interro-negative form

Simple form	V-ing form
mustn't I fold? mustn't you fold? mustn't she fold? mustn't we fold? mustn't you fold? mustn't they fold?	mustn't I be folding? mustn't you be folding? mustn't she be folding? mustn't we be folding? mustn't you be folding? mustn't they be folding?
Perfect	V-ing perfect
mustn't I have folded? mustn't you have folded? mustn't she have folded? mustn't we have folded? mustn't you have folded? mustn't they have folded?	mustn't I have been folding? mustn't you have been folding? mustn't she have been folding? mustn't we have been folding? mustn't you have been folding? mustn't they have been folding?