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 cannot fur you cannot fur he cannot fur we cannot fur you cannot fur they cannot fur	I cannot be furring you cannot be furring he cannot be furring we cannot be furring you cannot be furring they cannot be furring
Perfect	V-ing perfect
I cannot have furred you cannot have furred he cannot have furred we cannot have furred you cannot have furred they cannot have furred	I cannot have been furring you cannot have been furring he cannot have been furring we cannot have been furring you cannot have been furring they cannot 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 I not fur? can you not fur? can he not fur? can we not fur? can you not fur? can they not fur?	can I not be furring? can you not be furring? can he not be furring? can we not be furring? can you not be furring? can they not be furring?
Perfect	V-ing perfect
can I not have furred? can you not have furred? can he not have furred? can we not have furred? can you not have furred? can they not have furred?	can I not have been furring? can you not have been furring? can he not have been furring? can we not have been furring? can you not have been furring? can they not have been furring?