A group of people are either standing or sitting , some are wearing hats and scarves , while some are not .
A boy is surfing .
A group of people are either standing or sitting, some are wearing hats and scarves, while some are not.
A boy is surfing.
A group is more than one boy.  One cannot be standing or sitting while also surfing.  One does not engage in surfing while wearing hats and scarves.
A group is more than one boy . One can not be standing or sitting while also surfing . One does not engage in surfing while wearing hats and scarves .