The 2nd conditional sentence structure is also called the present unreal conditional or hypothetical conditional.
We use this conditional to talk about what we imagine in a different situation that is unlikely in the present, to talk about "impossible" situations and it is also often used to give advice. Let's take a look at some examples:
Impossible situations:
If I had his number, I would call him.(I don't have his number now, so it's impossible for me to call him).
Unlikely situations:
If I lived in Japan, I'd have sushi every day.
To give advice:
If I were you, I'd look for a newplace to live.
If you like the TV series "Friends", then you can review the 2nd conditional by watching this video:
