English verb conjugation
MUST UPSHIFT

Regular verb: upshift - upshifted - upshifted

Affirmation

Simple form	V-ing form
I must upshift you must upshift he must upshift we must upshift you must upshift they must upshift	I must be upshifting you must be upshifting he 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 he 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 he 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 must not upshift you must not upshift he must not upshift we must not upshift you must not upshift they must not upshift	I must not be upshifting you must not be upshifting he must not be upshifting we must not be upshifting you must not be upshifting they must not be upshifting
Perfect	V-ing perfect
I must not have upshifted you must not have upshifted he must not have upshifted we must not have upshifted you must not have upshifted they must not have upshifted	I must not have been upshifting you must not have been upshifting he must not have been upshifting we must not have been upshifting you must not have been upshifting they must not have been upshifting

Interrogative form

Simple form	V-ing form
must I upshift? must you upshift? must he upshift? must we upshift? must you upshift? must they upshift?	must I be upshifting? must you be upshifting? must he 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 he 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 he 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
must I not upshift? must you not upshift? must he not upshift? must we not upshift? must you not upshift? must they not upshift?	must I not be upshifting? must you not be upshifting? must he not be upshifting? must we not be upshifting? must you not be upshifting? must they not be upshifting?
Perfect	V-ing perfect
must I not have upshifted? must you not have upshifted? must he not have upshifted? must we not have upshifted? must you not have upshifted? must they not have upshifted?	must I not have been upshifting? must you not have been upshifting? must he not have been upshifting? must we not have been upshifting? must you not have been upshifting? must they not have been upshifting?