9. Lan was designing the red skirt.

• The red skirt was being designed by Lan.

10. Lan has designed the red skirt.

• The red skirt has been designed by Lan.

11. Lan had designed the red skirt.

• The red skirt had been designed by Lan.

12. I can answer the question.

• The question can be answered by me.

13. She will carry the box.

• The box will be carried by her.