1
主语从句
如
it
is
clear
that
he
has
failed
2
强调句型
如
it
is
clearly
that
he
speaks.
3
it
是指示
代词
that
是同位语从句
或定语从句
如it
is
the
news
that
our
team
has
won.
it
is
the
news
that
he
told
me.本句也可以看作是强调句
4
it
表示时间天气距离等
如it
is
so
hot
that
we
won't
go
out.
迷惑
强调句
的题
如it
was
at
seven
clock
----he
arrived
答案是that
这是强调句
it
was
seven
clock
----he
arrived
答案是when这是状语从句
it
is
three
years
-----he
came
here.答案是since这是状语从句
it
is
for
three
years
----he
has
been
here
答案是that
这是强调句
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