could upshift
Regular verb: upshift - upshifted- upshifted

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

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

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

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