I don't have Mary's address,so I can't write a letter to her.改为虚拟语气

I don't have Mary's address,so I can't write a letter to her.改为虚拟语气
I don't have Mary's address,so I can't write a letter to her.改为虚拟语气

I don't have Mary's address,so I can't write a letter to her.改为虚拟语气
I would write a letter to Mary,but I havn't her address.