Question

it was 3:45 in the morning when the vote was finally taken. it做形式主语，when引导的从

it was 3:45 in the morning when the vote was finally taken. it做形式主语，when引导的从句做真正的主语吗

Answer 1

it was+ 时间某一点+when+
可以理解成：当-------时,时间是----点.when引导时间状语从句.it was 3:45 in the morning when the vote was finally taken.=When the vote was finally taken,it was 3:45 in the morning.

也可以理解成:当时是10点,他是在此时离开的.when引导定语从句=at which即at ten/at the time

Answer 2

it
was
3:45
in
the
morning
是句子主干，后面when引导的是定语从句，修饰3:45
in
the
morning
精，锐，教，育，五，角，场

Answer 3

是的，你分析得没错。
句子翻译：当投票最终被接受的时候是凌晨3:45。