English verb conjugation
SHOULD PUFF

Regular verb: puff - puffed - puffed

Affirmation

Simple form	V-ing form
I'd puff you'd puff he'd puff we'd puff you'd puff they'd puff	I'd be puffing you'd be puffing he'd be puffing we'd be puffing you'd be puffing they'd be puffing
Perfect	V-ing perfect
I should've puffed you should've puffed he should've puffed we should've puffed you should've puffed they should've puffed	I should've been puffing you should've been puffing he should've been puffing we should've been puffing you should've been puffing they should've been puffing

Negation

Simple form	V-ing form
I shouldn't puff you shouldn't puff he shouldn't puff we shouldn't puff you shouldn't puff they shouldn't puff	I shouldn't be puffing you shouldn't be puffing he shouldn't be puffing we shouldn't be puffing you shouldn't be puffing they shouldn't be puffing
Perfect	V-ing perfect
I shouldn't have puffed you shouldn't have puffed he shouldn't have puffed we shouldn't have puffed you shouldn't have puffed they shouldn't have puffed	I shouldn't have been puffing you shouldn't have been puffing he shouldn't have been puffing we shouldn't have been puffing you shouldn't have been puffing they shouldn't have been puffing

Interrogative form

Simple form	V-ing form
should I puff? should you puff? should he puff? should we puff? should you puff? should they puff?	should I be puffing? should you be puffing? should he be puffing? should we be puffing? should you be puffing? should they be puffing?
Perfect	V-ing perfect
should I have puffed? should you have puffed? should he have puffed? should we have puffed? should you have puffed? should they have puffed?	should I have been puffing? should you have been puffing? should he have been puffing? should we have been puffing? should you have been puffing? should they have been puffing?

Interro-negative form

Simple form	V-ing form
shouldn't I puff? shouldn't you puff? shouldn't he puff? shouldn't we puff? shouldn't you puff? shouldn't they puff?	shouldn't I be puffing? shouldn't you be puffing? shouldn't he be puffing? shouldn't we be puffing? shouldn't you be puffing? shouldn't they be puffing?
Perfect	V-ing perfect
shouldn't I have puffed? shouldn't you have puffed? shouldn't he have puffed? shouldn't we have puffed? shouldn't you have puffed? shouldn't they have puffed?	shouldn't I have been puffing? shouldn't you have been puffing? shouldn't he have been puffing? shouldn't we have been puffing? shouldn't you have been puffing? shouldn't they have been puffing?