For the pop song example, I chose Pop 101 by Marianas Trench, found here:

https://www.youtube.com/watch?v=yBDNvlvR8vA

The introduction can be found from time 0:00 until time 0:16, and is characterized by the vocal tones and no lyrics, and ends with the introduction to the beat.

The verses can be found at times 0:16 - 0:48 , and 1:28 - 2:00.

As stated in the song, the pre-chorus is present at time 0:48-0:55, and 2:00-2:08.

The refrain can be found from 0:55-1:28, 2:08-2:40, and 3:12-3:44 (the third refrain happens after the bridge, not the pre-chorus).

The bridge is the section from 2:40- 3:12, which is markedly different form either the verses or the refrain.

The conclusion starts at 3:44 and continues until the end.

Conveniently, the lyrics to the song also point out most of these structures.