Remember, this is just my own opinion, you don't have to agree. Tell me how you would think they would sing it in the comments. :)
Reasons for why I gave the parts to each member:
I gave Jeongyeon Jihyo's pre-chorus parts as I feel as if she would suit her parts the best. I gave Dahyun and Chaeyoung Nayeon's pre-chorus parts (1 each) as I feel as if their voice would suit it and they would be able to perform it. The last part of the song, Jihyo's and Nayeon's "Durudurudu" parts, I gave to Tzuyu and Sana as it is the same lyric they sing in the chorus as well, so it made sense to me, and I feel they could sing it. :)
Song: TWICE - "SIGNAL"