English verb conjugation
CAN RIFFLE

Regular verb: riffle - riffled - riffled

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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