English verb conjugation
CAN UPSHIFT

Regular verb: upshift - upshifted - upshifted

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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