Could I understand that like this? Nevertheless, such a generalisation does not take us far towards an understanding of why the revolution broke out when it did, and why it took the remarkable road it did. --- why the revolution broke out when it(the revolution) did(broke out), and why it(the revolution) took the remarkable road [which] it(the revolution) did(took the remarkable road) Could I understand that like this? I really wonder why the last phrase(it did) of this sentence was used? Is it for emphasis? Please help me! Thanks!^^