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 cannot riffle you cannot riffle he cannot riffle we cannot riffle you cannot riffle they cannot riffle	I cannot be riffling you cannot be riffling he cannot be riffling we cannot be riffling you cannot be riffling they cannot be riffling
Perfect	V-ing perfect
I cannot have riffled you cannot have riffled he cannot have riffled we cannot have riffled you cannot have riffled they cannot have riffled	I cannot have been riffling you cannot have been riffling he cannot have been riffling we cannot have been riffling you cannot have been riffling they cannot 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 I not riffle? can you not riffle? can he not riffle? can we not riffle? can you not riffle? can they not riffle?	can I not be riffling? can you not be riffling? can he not be riffling? can we not be riffling? can you not be riffling? can they not be riffling?
Perfect	V-ing perfect
can I not have riffled? can you not have riffled? can he not have riffled? can we not have riffled? can you not have riffled? can they not have riffled?	can I not have been riffling? can you not have been riffling? can he not have been riffling? can we not have been riffling? can you not have been riffling? can they not have been riffling?