It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句

It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句
It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句

It is high time that they started out.他们该动身了.请问这是定语从句 强调句还是主语从句
虚拟语气,不是强调也不是主语从句

定语从句，先行词是time

语法书上把他当定语从句的
that可以省略

都不是
it is high time that固定句式