Помогите пожалуйста.Напишите предложения правильно:​

1. They have never ridden an elephant. 2. We have already come. 3. How many times have they visited to a wildlife park? 4. Who has helped you with your suitcases? 5. I wrote to Santa Claus twice. 6. Sam has never visited the national park. 7. We have not met a celebrity yet. 8. Have you ever had a dog, Kate?