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 cannot upshift you cannot upshift he cannot upshift we cannot upshift you cannot upshift they cannot upshift	I cannot be upshifting you cannot be upshifting he cannot be upshifting we cannot be upshifting you cannot be upshifting they cannot be upshifting
Perfect	V-ing perfect
I cannot have upshifted you cannot have upshifted he cannot have upshifted we cannot have upshifted you cannot have upshifted they cannot have upshifted	I cannot have been upshifting you cannot have been upshifting he cannot have been upshifting we cannot have been upshifting you cannot have been upshifting they cannot 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 I not upshift? can you not upshift? can he not upshift? can we not upshift? can you not upshift? can they not upshift?	can I not be upshifting? can you not be upshifting? can he not be upshifting? can we not be upshifting? can you not be upshifting? can they not be upshifting?
Perfect	V-ing perfect
can I not have upshifted? can you not have upshifted? can he not have upshifted? can we not have upshifted? can you not have upshifted? can they not have upshifted?	can I not have been upshifting? can you not have been upshifting? can he not have been upshifting? can we not have been upshifting? can you not have been upshifting? can they not have been upshifting?