英语中的强调句式怎么用？

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。
It
is
from
the
sun
that
we
get
light
and
heat.
It
was
not
until
I
had
read
your
letter
that
I
understood
the
true
state
of
affairs.
典型例题
1）
It
was
last
night
___
I
see
the
comet.
A.
the
time
B.
when
C.
that
D.
which
答案C.
强调句的结构是：
It
+be
+强调部分
+
that
(who)
+
主谓句。
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
yesterday
evening.
强调主语：
It
was
my
father
who
did
the
experiment
in
the
lab
yesterday
evening.
强调宾语：
It
was
the
experiment
that
my
father
did
in
the
lab
yesterday
evening.
强调时间：
It
was
yesterday
evening
that
my
father
did
the
experiment
in
the
lab.
(注意不用when)
强调地点：
It
was
in
the
lab
that
my
father
did
the
experiment
yesterday
evening.