English verb conjugation
COULD UPCHUCK

Regular verb: upchuck - upchucked - upchucked

Affirmation

Simple form	V-ing form
I could upchuck you could upchuck he could upchuck we could upchuck you could upchuck they could upchuck	I could be upchucking you could be upchucking he could be upchucking we could be upchucking you could be upchucking they could be upchucking
Perfect	V-ing perfect
I could have upchucked you could have upchucked he could have upchucked we could have upchucked you could have upchucked they could have upchucked	I could have been upchucking you could have been upchucking he could have been upchucking we could have been upchucking you could have been upchucking they could have been upchucking

Negation

Simple form	V-ing form
I couldn't upchuck you couldn't upchuck he couldn't upchuck we couldn't upchuck you couldn't upchuck they couldn't upchuck	I couldn't be upchucking you couldn't be upchucking he couldn't be upchucking we couldn't be upchucking you couldn't be upchucking they couldn't be upchucking
Perfect	V-ing perfect
I couldn't have upchucked you couldn't have upchucked he couldn't have upchucked we couldn't have upchucked you couldn't have upchucked they couldn't have upchucked	I couldn't have been upchucking you couldn't have been upchucking he couldn't have been upchucking we couldn't have been upchucking you couldn't have been upchucking they couldn't have been upchucking

Interrogative form

Simple form	V-ing form
could I upchuck? could you upchuck? could he upchuck? could we upchuck? could you upchuck? could they upchuck?	could I be upchucking? could you be upchucking? could he be upchucking? could we be upchucking? could you be upchucking? could they be upchucking?
Perfect	V-ing perfect
could I have upchucked? could you have upchucked? could he have upchucked? could we have upchucked? could you have upchucked? could they have upchucked?	could I have been upchucking? could you have been upchucking? could he have been upchucking? could we have been upchucking? could you have been upchucking? could they have been upchucking?

Interro-negative form

Simple form	V-ing form
couldn't I upchuck? couldn't you upchuck? couldn't he upchuck? couldn't we upchuck? couldn't you upchuck? couldn't they upchuck?	couldn't I be upchucking? couldn't you be upchucking? couldn't he be upchucking? couldn't we be upchucking? couldn't you be upchucking? couldn't they be upchucking?
Perfect	V-ing perfect
couldn't I have upchucked? couldn't you have upchucked? couldn't he have upchucked? couldn't we have upchucked? couldn't you have upchucked? couldn't they have upchucked?	couldn't I have been upchucking? couldn't you have been upchucking? couldn't he have been upchucking? couldn't we have been upchucking? couldn't you have been upchucking? couldn't they have been upchucking?