English verb conjugation
CAN FUR

Regular verb: fur - furred - furred

Affirmation

Simple form	V-ing form
I can fur you can fur he can fur we can fur you can fur they can fur	I can be furring you can be furring he can be furring we can be furring you can be furring they can be furring
Perfect	V-ing perfect
I can have furred you can have furred he can have furred we can have furred you can have furred they can have furred	I can have been furring you can have been furring he can have been furring we can have been furring you can have been furring they can have been furring

Negation

Simple form	V-ing form
I can't fur you can't fur he can't fur we can't fur you can't fur they can't fur	I can't be furring you can't be furring he can't be furring we can't be furring you can't be furring they can't be furring
Perfect	V-ing perfect
I can't have furred you can't have furred he can't have furred we can't have furred you can't have furred they can't have furred	I can't have been furring you can't have been furring he can't have been furring we can't have been furring you can't have been furring they can't have been furring

Interrogative form

Simple form	V-ing form
can I fur? can you fur? can he fur? can we fur? can you fur? can they fur?	can I be furring? can you be furring? can he be furring? can we be furring? can you be furring? can they be furring?
Perfect	V-ing perfect
can I have furred? can you have furred? can he have furred? can we have furred? can you have furred? can they have furred?	can I have been furring? can you have been furring? can he have been furring? can we have been furring? can you have been furring? can they have been furring?

Interro-negative form

Simple form	V-ing form
can't I fur? can't you fur? can't he fur? can't we fur? can't you fur? can't they fur?	can't I be furring? can't you be furring? can't he be furring? can't we be furring? can't you be furring? can't they be furring?
Perfect	V-ing perfect
can't I have furred? can't you have furred? can't he have furred? can't we have furred? can't you have furred? can't they have furred?	can't I have been furring? can't you have been furring? can't he have been furring? can't we have been furring? can't you have been furring? can't they have been furring?