A. My dream is PD --> My dream is to be a PD.

=> Corrected: The sentence is corrected grammatically.​

B. Are they nurse? --> Are they nurses?

=> Corrected: The sentence is corrected grammatically.​

 Yes  they are. --> Yes, they are.

=> Corrected punctuation.​

  Are they doctor. --> Are they doctors?

=> Corrected: The sentence is corrected grammatically.​​