When do the girls find out that Toby is A on Pretty Little Liars?

Answer 1

They find out who the first A is in Unbelievable. They don't find out who the second A REALLY is until the last book, Wanted
at the end of the season 2 they found out that Mona was A but at season 3 they found out that Alison had a twin named Courtney who was possibly A

Answer 2

Yes but then she gets hit by the car and she has memory loss but eventually remembers.

Answer 3

Yes , in the end they find out that Allison was never dead and it was her twin sister Courtney who pretended to be Alli. the whole time and Allison killed Courtney

Answer 4

The last episode of 2nd season :) that's the first A

Answer 5

yes

Answer 6

3X20