English verb conjugation
CAN PIFFLE

Regular verb: piffle - piffled - piffled

Affirmation

Simple form	V-ing form
I can piffle you can piffle he can piffle we can piffle you can piffle they can piffle	I can be piffling you can be piffling he can be piffling we can be piffling you can be piffling they can be piffling
Perfect	V-ing perfect
I can have piffled you can have piffled he can have piffled we can have piffled you can have piffled they can have piffled	I can have been piffling you can have been piffling he can have been piffling we can have been piffling you can have been piffling they can have been piffling

Negation

Simple form	V-ing form
I cannot piffle you cannot piffle he cannot piffle we cannot piffle you cannot piffle they cannot piffle	I cannot be piffling you cannot be piffling he cannot be piffling we cannot be piffling you cannot be piffling they cannot be piffling
Perfect	V-ing perfect
I cannot have piffled you cannot have piffled he cannot have piffled we cannot have piffled you cannot have piffled they cannot have piffled	I cannot have been piffling you cannot have been piffling he cannot have been piffling we cannot have been piffling you cannot have been piffling they cannot have been piffling

Interrogative form

Simple form	V-ing form
can I piffle? can you piffle? can he piffle? can we piffle? can you piffle? can they piffle?	can I be piffling? can you be piffling? can he be piffling? can we be piffling? can you be piffling? can they be piffling?
Perfect	V-ing perfect
can I have piffled? can you have piffled? can he have piffled? can we have piffled? can you have piffled? can they have piffled?	can I have been piffling? can you have been piffling? can he have been piffling? can we have been piffling? can you have been piffling? can they have been piffling?

Interro-negative form

Simple form	V-ing form
can I not piffle? can you not piffle? can he not piffle? can we not piffle? can you not piffle? can they not piffle?	can I not be piffling? can you not be piffling? can he not be piffling? can we not be piffling? can you not be piffling? can they not be piffling?
Perfect	V-ing perfect
can I not have piffled? can you not have piffled? can he not have piffled? can we not have piffled? can you not have piffled? can they not have piffled?	can I not have been piffling? can you not have been piffling? can he not have been piffling? can we not have been piffling? can you not have been piffling? can they not have been piffling?