#1 & #2 These are fine if "You" is plural. (If "You" is singular, then the sentence must end with "be a doctor" #3 & #4 These are good but, remember, the "you" must be the plural. #5 You / We / They will be doctors, won't you/we/they? #6 You / We / They won't be doctors, will you/we/they? (Awkward to switch affirmative to negative, but OK) #7 & 8 Use a comma after "I said, " Remember that in all these sentences the "You" must be the plural (you all) or the sentences won't work.

You will be a doctor. We will be doctors They will be doctors. You will not be a doctor. We will not be doctors. They will not be doctors. Will you be a doctor? Will we be doctors? Will they be doctors? Will not you be a doctor? Will not we be doctors? Will not they be doctors? Your will be a doctor.won't you? We will be doctors.won't we? They will be doctors.won't they? You will not be a doctor.will you? We will not be doctors.will we? They will not be doctors.will they? I said, would you be a doctor? I said, would we not be doctors? I said, would we not be doctors? I said, wouldn't you be a doctor? I said, wouldn"t we be doctors? I said, wouldn't they be doctors?

I'm confused a little, you have too many options. Most sound correct. maybe just write the sentences without the options and it will be easier to correct.

These are good and natural sounding!