Men , surrounded by nature , are riding mountain bikes .
It is probably the case that the men are going to build a camp when they are done riding their mountain bikes .
It is unlikely that the men are going to build a camp when they are done riding their mountain bikes .
It is probably the case that the men are going to build a camp when they are done riding their mountain bikes .
The men are going to build a camp when they are done riding their mountain bikes .