Oi Gabriel, "Barcelona bounced back from a bad start to defeat Real Madrid and then sailed through to the Champions League quarter-finals." Make sure you maintain the past tense and don't forget to use articles with specific titles. I hope this helps! Boa Sorte, Greg

Your sentence is fine. The only adjustment it needs is to add a 'the' before 'Champions League quarter-finals.' "Barcelona bounced back from a bad start to defeat Real Madrid and sail through to the Champions League quarter-finals." The verb forms are all fine : it is correct that both 'defeat' and 'sail' are in the infinitive form, because they both follow on directly from 'bounced back to...'. It's a nice sentence, with good use of natural idioms.