First- and second-time bars

At the end of a repeated section you may come across something like this:

first-second-time-bars

This is when a repeated section has two different endings. The first time you sing this section you sing the First-time bar (marked 1.) and then repeat the section. When you get to the end you DO NOT SING the first-time bar (because that was just for the First Time); you will sing the Second-Time bar instead (the bit marked 2.) and then carry on with the rest of the song.