English verb conjugation
COULD UPSTART

Regular verb: upstart - upstarted - upstarted

Affirmation

Simple form	V-ing form
I could upstart you could upstart he could upstart we could upstart you could upstart they could upstart	I could be upstarting you could be upstarting he could be upstarting we could be upstarting you could be upstarting they could be upstarting
Perfect	V-ing perfect
I could have upstarted you could have upstarted he could have upstarted we could have upstarted you could have upstarted they could have upstarted	I could have been upstarting you could have been upstarting he could have been upstarting we could have been upstarting you could have been upstarting they could have been upstarting

Negation

Simple form	V-ing form
I could not upstart you could not upstart he could not upstart we could not upstart you could not upstart they could not upstart	I could not be upstarting you could not be upstarting he could not be upstarting we could not be upstarting you could not be upstarting they could not be upstarting
Perfect	V-ing perfect
I could not have upstarted you could not have upstarted he could not have upstarted we could not have upstarted you could not have upstarted they could not have upstarted	I could not have been upstarting you could not have been upstarting he could not have been upstarting we could not have been upstarting you could not have been upstarting they could not have been upstarting

Interrogative form

Simple form	V-ing form
could I upstart? could you upstart? could he upstart? could we upstart? could you upstart? could they upstart?	could I be upstarting? could you be upstarting? could he be upstarting? could we be upstarting? could you be upstarting? could they be upstarting?
Perfect	V-ing perfect
could I have upstarted? could you have upstarted? could he have upstarted? could we have upstarted? could you have upstarted? could they have upstarted?	could I have been upstarting? could you have been upstarting? could he have been upstarting? could we have been upstarting? could you have been upstarting? could they have been upstarting?

Interro-negative form

Simple form	V-ing form
could I not upstart? could you not upstart? could he not upstart? could we not upstart? could you not upstart? could they not upstart?	could I not be upstarting? could you not be upstarting? could he not be upstarting? could we not be upstarting? could you not be upstarting? could they not be upstarting?
Perfect	V-ing perfect
could I not have upstarted? could you not have upstarted? could he not have upstarted? could we not have upstarted? could you not have upstarted? could they not have upstarted?	could I not have been upstarting? could you not have been upstarting? could he not have been upstarting? could we not have been upstarting? could you not have been upstarting? could they not have been upstarting?