English verb conjugation
WOULD STIFF

Regular verb: stiff - stiffed - stiffed

Affirmation

Simple form	V-ing form
I'd stiff you'd stiff he'd stiff we'd stiff you'd stiff they'd stiff	I'd be stiffing you'd be stiffing he'd be stiffing we'd be stiffing you'd be stiffing they'd be stiffing
Perfect	V-ing perfect
I would've stiffed you would've stiffed he would've stiffed we would've stiffed you would've stiffed they would've stiffed	I would've been stiffing you would've been stiffing he would've been stiffing we would've been stiffing you would've been stiffing they would've been stiffing

Negation

Simple form	V-ing form
I wouldn't stiff you wouldn't stiff he wouldn't stiff we wouldn't stiff you wouldn't stiff they wouldn't stiff	I wouldn't be stiffing you wouldn't be stiffing he wouldn't be stiffing we wouldn't be stiffing you wouldn't be stiffing they wouldn't be stiffing
Perfect	V-ing perfect
I wouldn't have stiffed you wouldn't have stiffed he wouldn't have stiffed we wouldn't have stiffed you wouldn't have stiffed they wouldn't have stiffed	I wouldn't have been stiffing you wouldn't have been stiffing he wouldn't have been stiffing we wouldn't have been stiffing you wouldn't have been stiffing they wouldn't have been stiffing

Interrogative form

Simple form	V-ing form
would I stiff? would you stiff? would he stiff? would we stiff? would you stiff? would they stiff?	would I be stiffing? would you be stiffing? would he be stiffing? would we be stiffing? would you be stiffing? would they be stiffing?
Perfect	V-ing perfect
would I have stiffed? would you have stiffed? would he have stiffed? would we have stiffed? would you have stiffed? would they have stiffed?	would I have been stiffing? would you have been stiffing? would he have been stiffing? would we have been stiffing? would you have been stiffing? would they have been stiffing?

Interro-negative form

Simple form	V-ing form
wouldn't I stiff? wouldn't you stiff? wouldn't he stiff? wouldn't we stiff? wouldn't you stiff? wouldn't they stiff?	wouldn't I be stiffing? wouldn't you be stiffing? wouldn't he be stiffing? wouldn't we be stiffing? wouldn't you be stiffing? wouldn't they be stiffing?
Perfect	V-ing perfect
wouldn't I have stiffed? wouldn't you have stiffed? wouldn't he have stiffed? wouldn't we have stiffed? wouldn't you have stiffed? wouldn't they have stiffed?	wouldn't I have been stiffing? wouldn't you have been stiffing? wouldn't he have been stiffing? wouldn't we have been stiffing? wouldn't you have been stiffing? wouldn't they have been stiffing?