English verb conjugation
MUST UPSHIFT

Regular verb: upshift - upshifted - upshifted

Affirmation

Simple form	V-ing form
I must upshift you must upshift she must upshift we must upshift you must upshift they must upshift	I must be upshifting you must be upshifting she must be upshifting we must be upshifting you must be upshifting they must be upshifting
Perfect	V-ing perfect
I must have upshifted you must have upshifted she must have upshifted we must have upshifted you must have upshifted they must have upshifted	I must have been upshifting you must have been upshifting she must have been upshifting we must have been upshifting you must have been upshifting they must have been upshifting

Negation

Simple form	V-ing form
I mustn't upshift you mustn't upshift she mustn't upshift we mustn't upshift you mustn't upshift they mustn't upshift	I mustn't be upshifting you mustn't be upshifting she mustn't be upshifting we mustn't be upshifting you mustn't be upshifting they mustn't be upshifting
Perfect	V-ing perfect
I mustn't have upshifted you mustn't have upshifted she mustn't have upshifted we mustn't have upshifted you mustn't have upshifted they mustn't have upshifted	I mustn't have been upshifting you mustn't have been upshifting she mustn't have been upshifting we mustn't have been upshifting you mustn't have been upshifting they mustn't have been upshifting

Interrogative form

Simple form	V-ing form
must I upshift? must you upshift? must she upshift? must we upshift? must you upshift? must they upshift?	must I be upshifting? must you be upshifting? must she be upshifting? must we be upshifting? must you be upshifting? must they be upshifting?
Perfect	V-ing perfect
must I have upshifted? must you have upshifted? must she have upshifted? must we have upshifted? must you have upshifted? must they have upshifted?	must I have been upshifting? must you have been upshifting? must she have been upshifting? must we have been upshifting? must you have been upshifting? must they have been upshifting?

Interro-negative form

Simple form	V-ing form
mustn't I upshift? mustn't you upshift? mustn't she upshift? mustn't we upshift? mustn't you upshift? mustn't they upshift?	mustn't I be upshifting? mustn't you be upshifting? mustn't she be upshifting? mustn't we be upshifting? mustn't you be upshifting? mustn't they be upshifting?
Perfect	V-ing perfect
mustn't I have upshifted? mustn't you have upshifted? mustn't she have upshifted? mustn't we have upshifted? mustn't you have upshifted? mustn't they have upshifted?	mustn't I have been upshifting? mustn't you have been upshifting? mustn't she have been upshifting? mustn't we have been upshifting? mustn't you have been upshifting? mustn't they have been upshifting?