英语中“强调句型”是什么？

It
is
(was)
被强调部分+that
(who)
+
句子其他部分。
此结构强调的成分仅限于主语，宾语和状语。强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用
"who"，其余用that。
原句：
My
father
did
the
experiment
in
the
lab
yesterdayevening.
强调主语：
Itwas
my
father
who
did
the
experiment
in
the
lab
yesterday
evening.
强调宾语：
Itwas
the
experiment
that
my
father
did
in
the
lab
yesterday
evening.
强调时间：
Itwas
yesterday
evening
that
my
father
did
the
experiment
in
the
lab.
(注意不用when)
强调地点：
Itwas
in
the
lab
that
my
father
did
the
experiment
yesterday
evening.