Скажи мне, где ты был прошлой ночью.

Sentence Discussions Russian
#1

Can this also be “прошлою” or is that not valid?

1 Like
#2

Google Ngram Viewer for Russian shows that the frequency of прошлою is very low, far lower than that of прошлой:

#3
English Translation

Tell me where you were last night.

I believe “прошлою” could also be used, although it is nowadays considered archaic/poetic. Feel free to correct me, native Russian speakers.