ответить на эти вопросы will you have a birthday party? when will you have a birthday party? will you give him/her a gift? what gift will you give him/her? will you write a birthday card? what will you write in the birthday card?

Yes, I will.
I will have a birthday party tomorrow at 5 o'clock.
Yes, I will. I am going to give him a cake.
Yes, I will write a birthday card.
I will write congratulations by my heart in the birthday card.