Question

that引导的主语从句（it做形式主语）和强调句（It+was/is+who/whom/that)的

Answer 1

强调句可以强调句子中除谓语外的任何部分,并且去掉(It+was/is+who/whom/that)这个结构后句子仍能成立.
例:All
the
members
held
a
meeting
in
the
club
yesterday.
（强调all
the
members）
It
was
all
the
members
that
held
a
meeting
in
the
club
yesterday.
（强调a
meeting
）It
was
a
meeting
that
all
the
members
held
in
the
club
yesterday.
（强调in
the
club
）It
was
in
the
club
that
all
the
members
held
a
meeting
yesterday.
（强调yesterday）It
was
yesterday
that
all
the
members
held
a
meeting
in
the
club.
It
作形式主语代替主语从句，主要是为了平衡句子结构，主语从句的连接词没有变化。而it引导的强调句则是对句子某一部分进行强调，无论强调的是什么成分，都可用连词that。被强调部分指人是也可用who/whom。主语从句：It
is
+形容词/名词/某些动词ed
+
that
从句.