quote:Does 'ar a raibh' generally connote 'everything'?
Yes, pretty much, or "all", although this is fairly often translated "what". See de Bhaldraithe s.v. "what" for examples. If the focus is to be on a specific singular subject, you have little choice but to specify that using "rud" or "duine" or "an méid" or some other noun:
Smaoiním ar an rud a bhí ann... etc.