Это не правельно

Write these sentences in the passive voice

1. People celebrate Christmas on the 25th of December.

2. Somebody wrote a letter to me.

3. Somebody made this bag of leather.

4. Leonardo da Vinci painted “The Mona Lisa”.

5. Peter the Great founded Saint Petersburg in 1703.

6. They built a new museum of modern art in our city.

ПОМОГИТЕ,СРОЧНО!!!!!!!!!!!!!!

нужно написать эти предложения в страдательном залоге