1.I will buy this house nexth month
=> this house will be bought nexth month
2.We will shut the door in 2 seconds
=> the door will be shut  in 2 seconds
3.LAn will call you as soon as she arrives
=> you will bư called by lan as she arrives
4.I will bring it back soon
=> it will be brought  back soon
5.I will finish my home work in one house
=> my home work will be finished  in one house