Сделать все виды вопросов это предложения present perfect tense ann has just finished your work

I have never seen a white bear. I have just finished my composition. He has already done his homework. Our team has won the competition. I haven't decided where to go on holidays yet. We haven't planned the situation. Have you had your breakfast yet? Have you finished the letter? Why has he come so early?  Where have you bought this lovely dress? How much have you paid for it?