I think you will understand this example really well!
Watch Dan´s 90 seconds review from BBC Learning English for a quick explanation.
Now watch these videos for a more grammatical explanation:
Listen to this dialogue from BBC Learning English to understand IF situations:
How many songs that include the word IF can you find?
A very famous one is "If I were a boy"
Now listen to this wonderful song to understand the 2nd conditional sentences:
Another great song by Katy Perry : If We Ever Meet Again
