"Good morning, Anna."
Translation:Доброе утро, Анна.
It's not complicated, you just need to remember of gender of question, when you ask or tell. Any phrase you can check by a gender question. For example: "Зимний лес". Male gender, and control question is "КАКОЙ лес?". Last letters in КАКОЙ shows you that you need to use "Зимний" and not "Зимняя" (КАКАЯ) or "Зимнее" (КАКОЕ). I hope it helps you.