Two people walking down a sidewalk , both of which are carrying balloons .
A puppy is sitting .
Two people walking down a sidewalk, both of which are carrying balloons.
A puppy is sitting.
Two people is not the same as "a puppy", and while they are walking down a sidewalk, the puppy is sitting.
Two people is not the same as `` a puppy '' , and while they are walking down a sidewalk , the puppy is sitting .