English verb conjugation
SHOULD RIFFLE

Regular verb: riffle - riffled - riffled

Affirmation

Simple form	V-ing form
I'd riffle you'd riffle he'd riffle we'd riffle you'd riffle they'd riffle	I'd be riffling you'd be riffling he'd be riffling we'd be riffling you'd be riffling they'd be riffling
Perfect	V-ing perfect
I should've riffled you should've riffled he should've riffled we should've riffled you should've riffled they should've riffled	I should've been riffling you should've been riffling he should've been riffling we should've been riffling you should've been riffling they should've been riffling

Negation

Simple form	V-ing form
I shouldn't riffle you shouldn't riffle he shouldn't riffle we shouldn't riffle you shouldn't riffle they shouldn't riffle	I shouldn't be riffling you shouldn't be riffling he shouldn't be riffling we shouldn't be riffling you shouldn't be riffling they shouldn't be riffling
Perfect	V-ing perfect
I shouldn't have riffled you shouldn't have riffled he shouldn't have riffled we shouldn't have riffled you shouldn't have riffled they shouldn't have riffled	I shouldn't have been riffling you shouldn't have been riffling he shouldn't have been riffling we shouldn't have been riffling you shouldn't have been riffling they shouldn't have been riffling

Interrogative form

Simple form	V-ing form
should I riffle? should you riffle? should he riffle? should we riffle? should you riffle? should they riffle?	should I be riffling? should you be riffling? should he be riffling? should we be riffling? should you be riffling? should they be riffling?
Perfect	V-ing perfect
should I have riffled? should you have riffled? should he have riffled? should we have riffled? should you have riffled? should they have riffled?	should I have been riffling? should you have been riffling? should he have been riffling? should we have been riffling? should you have been riffling? should they have been riffling?

Interro-negative form

Simple form	V-ing form
shouldn't I riffle? shouldn't you riffle? shouldn't he riffle? shouldn't we riffle? shouldn't you riffle? shouldn't they riffle?	shouldn't I be riffling? shouldn't you be riffling? shouldn't he be riffling? shouldn't we be riffling? shouldn't you be riffling? shouldn't they be riffling?
Perfect	V-ing perfect
shouldn't I have riffled? shouldn't you have riffled? shouldn't he have riffled? shouldn't we have riffled? shouldn't you have riffled? shouldn't they have riffled?	shouldn't I have been riffling? shouldn't you have been riffling? shouldn't he have been riffling? shouldn't we have been riffling? shouldn't you have been riffling? shouldn't they have been riffling?