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 couldn't upstart you couldn't upstart he couldn't upstart we couldn't upstart you couldn't upstart they couldn't upstart	I couldn't be upstarting you couldn't be upstarting he couldn't be upstarting we couldn't be upstarting you couldn't be upstarting they couldn't be upstarting
Perfect	V-ing perfect
I couldn't have upstarted you couldn't have upstarted he couldn't have upstarted we couldn't have upstarted you couldn't have upstarted they couldn't have upstarted	I couldn't have been upstarting you couldn't have been upstarting he couldn't have been upstarting we couldn't have been upstarting you couldn't have been upstarting they couldn't 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
couldn't I upstart? couldn't you upstart? couldn't he upstart? couldn't we upstart? couldn't you upstart? couldn't they upstart?	couldn't I be upstarting? couldn't you be upstarting? couldn't he be upstarting? couldn't we be upstarting? couldn't you be upstarting? couldn't they be upstarting?
Perfect	V-ing perfect
couldn't I have upstarted? couldn't you have upstarted? couldn't he have upstarted? couldn't we have upstarted? couldn't you have upstarted? couldn't they have upstarted?	couldn't I have been upstarting? couldn't you have been upstarting? couldn't he have been upstarting? couldn't we have been upstarting? couldn't you have been upstarting? couldn't they have been upstarting?