Si Antonio estuviera en la fiesta, el hablaria con Juan.
This sentence means - If Antonio had gone to the party, he would have talked to Juan.
It is a hypothetical sentence, meaning that it didn't happen but states what could have happened had he decided to go to the party.
It means bored and boring it depends on the sentence!! Hope this helps if you still don’t get it I can help you!.
I think it’s 3 one I think I’m not sure
La luna se mira en el espejo del lago
It is a metaphor