English verb conjugation
CAN BIRL

Regular verb: birl - birled - birled

Affirmation

Simple form	V-ing form
I can birl you can birl he can birl we can birl you can birl they can birl	I can be birling you can be birling he can be birling we can be birling you can be birling they can be birling
Perfect	V-ing perfect
I can have birled you can have birled he can have birled we can have birled you can have birled they can have birled	I can have been birling you can have been birling he can have been birling we can have been birling you can have been birling they can have been birling

Negation

Simple form	V-ing form
I can't birl you can't birl he can't birl we can't birl you can't birl they can't birl	I can't be birling you can't be birling he can't be birling we can't be birling you can't be birling they can't be birling
Perfect	V-ing perfect
I can't have birled you can't have birled he can't have birled we can't have birled you can't have birled they can't have birled	I can't have been birling you can't have been birling he can't have been birling we can't have been birling you can't have been birling they can't have been birling

Interrogative form

Simple form	V-ing form
can I birl? can you birl? can he birl? can we birl? can you birl? can they birl?	can I be birling? can you be birling? can he be birling? can we be birling? can you be birling? can they be birling?
Perfect	V-ing perfect
can I have birled? can you have birled? can he have birled? can we have birled? can you have birled? can they have birled?	can I have been birling? can you have been birling? can he have been birling? can we have been birling? can you have been birling? can they have been birling?

Interro-negative form

Simple form	V-ing form
can't I birl? can't you birl? can't he birl? can't we birl? can't you birl? can't they birl?	can't I be birling? can't you be birling? can't he be birling? can't we be birling? can't you be birling? can't they be birling?
Perfect	V-ing perfect
can't I have birled? can't you have birled? can't he have birled? can't we have birled? can't you have birled? can't they have birled?	can't I have been birling? can't you have been birling? can't he have been birling? can't we have been birling? can't you have been birling? can't they have been birling?