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 can't piffle you can't piffle he can't piffle we can't piffle you can't piffle they can't piffle	I can't be piffling you can't be piffling he can't be piffling we can't be piffling you can't be piffling they can't be piffling
Perfect	V-ing perfect
I can't have piffled you can't have piffled he can't have piffled we can't have piffled you can't have piffled they can't have piffled	I can't have been piffling you can't have been piffling he can't have been piffling we can't have been piffling you can't have been piffling they can't 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't I piffle? can't you piffle? can't he piffle? can't we piffle? can't you piffle? can't they piffle?	can't I be piffling? can't you be piffling? can't he be piffling? can't we be piffling? can't you be piffling? can't they be piffling?
Perfect	V-ing perfect
can't I have piffled? can't you have piffled? can't he have piffled? can't we have piffled? can't you have piffled? can't they have piffled?	can't I have been piffling? can't you have been piffling? can't he have been piffling? can't we have been piffling? can't you have been piffling? can't they have been piffling?