Use the Past Perfect Passive forms.
Model: table/lay
THE TABLE HAD BEEN LAID BEFORE MOTHER CAME.
1.the pizza/send for
2.the flowers/water
3.the cake/make
4.the bread/buy
5.the guest/take care of
6.the dining-room/air

The pizza had been sent for  before guests went away
The flowers had been watered before I went to sleep
The cake had been made before I met my friends
The bread had been bought I read the story
The guest had been taken care of my pets before I came back home
The dining-room had been aired  before my parents arrived