si lo sé
1. (if I'd guessed) 
¡Qué aburrimiento de fiesta! Si lo sé no vengo.What a boring party! If I'd known I wouldn't have come.
¿Viste cómo se puso? Si lo sé no le digo nada.Did you see how worked up he got? Had I known I wouldn't have said a thing.
2. (if I have that information) 
a. if I know 
¿Por qué sabes tú lo que dijo Felipe? - Si lo sé es solo porque estaba allí cuando lo dijo.How come you know what Felipe said? - If I know it's only because I was there when he said it.
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