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 must not fold you must not fold she must not fold we must not fold you must not fold they must not fold	I must not be folding you must not be folding she must not be folding we must not be folding you must not be folding they must not be folding
Perfect	V-ing perfect
I must not have folded you must not have folded she must not have folded we must not have folded you must not have folded they must not have folded	I must not have been folding you must not have been folding she must not have been folding we must not have been folding you must not have been folding they must not 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
must I not fold? must you not fold? must she not fold? must we not fold? must you not fold? must they not fold?	must I not be folding? must you not be folding? must she not be folding? must we not be folding? must you not be folding? must they not be folding?
Perfect	V-ing perfect
must I not have folded? must you not have folded? must she not have folded? must we not have folded? must you not have folded? must they not have folded?	must I not have been folding? must you not have been folding? must she not have been folding? must we not have been folding? must you not have been folding? must they not have been folding?