3. They had painted my house before I traveled.

4. Who painted this house ?

5. Will my mother buy the ruler tomorrow ?

6. My sister gave this pizza to u.

7. My sister gave this pizza to you.

8. They let me go out. 

9. Nina has finished the pictures.

10. Did my father sell these houses ?

3. My house had been painted before I travelled.

⇒ They had painted my house before I traveled.

4. By whom was this house painted ?

⇒ Who painted this house ?

5. Will the ruler be bought by my mother tomorrow ? 

⇒ Will my mother buy the ruler tomorrow ?

6. This pizza was given to you by my sister.

⇒ My sister gave this pizza to u.

7. You were given this pizza by my sister.

⇒ My sister gave this pizza to you.

8. I was let to go out ⇒ They let me go out. 

9. The pictures have been finished by Nina.

⇒ Nina has finished the pictures.

10. Were these houses sold by my father ?

⇒ Did my father sell these houses ?