What buildings have yards?

How large are yards?

Are yard usually in the front, back or side/s of the building?
>If there are yards surrounding the buildings, which part tends to be the largest?

What are the yards usually covered in/filled with?
>>What type of grass?
>>Edible gardens?
>>Flower gardens?
>Other land-covering plants? (Clover, moss, etc)
>Pea gravel, sand, or rocks?
>Small buildings/sheds/gazebos/benches/etc?
>Water features?