πάλιν οὖν ἠρνήσατο ὁ Πέτρος, καὶ εὐθέως ἀλέκτωρ ἐφώνησεν.

1. πάλιν
   again
2. οὖν
   therefore
3. ἠρνήσατο
   denied
   he denied
4. ὁ
   the
5. Πέτρος
   Peter
6.  
   ,
    
7. καὶ
   and
8. εὐθέως
   immediately
9. ἀλέκτωρ
   rooster
10. ἐφώνησεν
    crowed
    cried out, he called
11.  
    .
     

Therefore Peter denied again, and immediately a rooster crowed.