A number of people cross in front of the top of an escalator .
THe people pass the top of the escalator .
A number of people cross in front of the top of an escalator.
THe people pass the top of the escalator.
The people cross in front of the top of an escalator so they pass the top of the escalator
The people cross in front of the top of an escalator so they pass the top of the escalator