Question

what day is it today?用It's Monday还是用It's on Monday?

Answer 1

本句
问的是
what
day
是对表语提问的
句子意思
是
今天是星期几？
回答
是
it
is
monday。今天是星期一。
如果是
对强调句型中的时间状语提问
则可以
回答
it
is
on
monday.
如
when
is
it
that
you
have
english
lesson?你们是什么时候
上英语课？
回答是
it
is
on
monday
that
we
have
english
lesson.我们上英语课
是在星期一。
简答
就是it
is
on
monday.在星期一

Answer 2

It's
Monday
It's
on
Monday表示“某活动在星期一举行”