A boy walking in the surf on a beach.
The boy is getting his feet wet.
The boy is on top of a mountain.
I am awaiting the end of the tornado season.
People are walking on the sidewalk.
The crowd is on a street.
A dog racing other dogs
Backfill techniques can be used to gather information on a case study so that it can be analysed in conjunction with other studies.
a dog is lying in the grass