English verb conjugation
CAN DOCTOR

Regular verb: doctor - doctored - doctored

Affirmation

Simple form	V-ing form
I can doctor you can doctor he can doctor we can doctor you can doctor they can doctor	I can be doctoring you can be doctoring he can be doctoring we can be doctoring you can be doctoring they can be doctoring
Perfect	V-ing perfect
I can have doctored you can have doctored he can have doctored we can have doctored you can have doctored they can have doctored	I can have been doctoring you can have been doctoring he can have been doctoring we can have been doctoring you can have been doctoring they can have been doctoring

Negation

Simple form	V-ing form
I can't doctor you can't doctor he can't doctor we can't doctor you can't doctor they can't doctor	I can't be doctoring you can't be doctoring he can't be doctoring we can't be doctoring you can't be doctoring they can't be doctoring
Perfect	V-ing perfect
I can't have doctored you can't have doctored he can't have doctored we can't have doctored you can't have doctored they can't have doctored	I can't have been doctoring you can't have been doctoring he can't have been doctoring we can't have been doctoring you can't have been doctoring they can't have been doctoring

Interrogative form

Simple form	V-ing form
can I doctor? can you doctor? can he doctor? can we doctor? can you doctor? can they doctor?	can I be doctoring? can you be doctoring? can he be doctoring? can we be doctoring? can you be doctoring? can they be doctoring?
Perfect	V-ing perfect
can I have doctored? can you have doctored? can he have doctored? can we have doctored? can you have doctored? can they have doctored?	can I have been doctoring? can you have been doctoring? can he have been doctoring? can we have been doctoring? can you have been doctoring? can they have been doctoring?

Interro-negative form

Simple form	V-ing form
can't I doctor? can't you doctor? can't he doctor? can't we doctor? can't you doctor? can't they doctor?	can't I be doctoring? can't you be doctoring? can't he be doctoring? can't we be doctoring? can't you be doctoring? can't they be doctoring?
Perfect	V-ing perfect
can't I have doctored? can't you have doctored? can't he have doctored? can't we have doctored? can't you have doctored? can't they have doctored?	can't I have been doctoring? can't you have been doctoring? can't he have been doctoring? can't we have been doctoring? can't you have been doctoring? can't they have been doctoring?