How long is a piece of string?Thanks, Joobs and Trisia, for your answer.
But do I say it when there is only a single "mob?"
I get it now. Thank you, Joobs, for your help.How long is a piece of string?
A mob is always plural. It could be a big mob or a small mob but it is still a grouping. If there were two rival gangs then one could say "the two mobs met and fought" but each mob would still be individually a grouping of individuals.