I must doctor you must doctor she must doctor we must doctor you must doctor they must doctor
V-ing form
I must be doctoring you must be doctoring she must be doctoring we must be doctoring you must be doctoring they must be doctoring
Perfect
I must have doctored you must have doctored she must have doctored we must have doctored you must have doctored they must have doctored
V-ing perfect
I must have been doctoring you must have been doctoring she must have been doctoring we must have been doctoring you must have been doctoring they must have been doctoring
Negation
Simple form
I must not doctor you must not doctor she must not doctor we must not doctor you must not doctor they must not doctor
V-ing form
I must not be doctoring you must not be doctoring she must not be doctoring we must not be doctoring you must not be doctoring they must not be doctoring
Perfect
I must not have doctored you must not have doctored she must not have doctored we must not have doctored you must not have doctored they must not have doctored
V-ing perfect
I must not have been doctoring you must not have been doctoring she must not have been doctoring we must not have been doctoring you must not have been doctoring they must not have been doctoring
Interrogative form
Simple form
must I doctor? must you doctor? must she doctor? must we doctor? must you doctor? must they doctor?
V-ing form
must I be doctoring? must you be doctoring? must she be doctoring? must we be doctoring? must you be doctoring? must they be doctoring?
Perfect
must I have doctored? must you have doctored? must she have doctored? must we have doctored? must you have doctored? must they have doctored?
V-ing perfect
must I have been doctoring? must you have been doctoring? must she have been doctoring? must we have been doctoring? must you have been doctoring? must they have been doctoring?
Interro-negative form
Simple form
must I not doctor? must you not doctor? must she not doctor? must we not doctor? must you not doctor? must they not doctor?
V-ing form
must I not be doctoring? must you not be doctoring? must she not be doctoring? must we not be doctoring? must you not be doctoring? must they not be doctoring?
Perfect
must I not have doctored? must you not have doctored? must she not have doctored? must we not have doctored? must you not have doctored? must they not have doctored?
V-ing perfect
must I not have been doctoring? must you not have been doctoring? must she not have been doctoring? must we not have been doctoring? must you not have been doctoring? must they not have been doctoring?