Hi Laia,
Your code actually works pretty well already, the only problem is that the text on the left overflows onto the text on the right. This is because you didn’t explicitly set a width to the text element, so it inherits the width of its container, the Canvas element
Just give an explicit width to your Text elements and you’ll be good:
getText(oneFirst?"sentence1":"sentence2").size(300,"auto").print( 20,0,getCanvas("frases")),
getText(oneFirst?"sentence2":"sentence1").size(300,"auto").print(350,0,getCanvas("frases")),
Jeremy