It'swhen
It'sbefore等等都不是强调句
强调句
（一）强调句句型
1、陈述句的强调句型：It
is/
was
+
that/
who（当强调主语且主语指人）+
其它部分。
特殊疑问句的强调句型：被强调部分（通常是疑问代词或疑问副词）+
is/
was
+
it
+
that/
who
+
其它部分？
not
…
until
…
句型的强调句
1、句型为：It
is/
was
not
until
+
被强调部分
+
that
+
其它部分
强调句
（一）强调句句型
1、陈述句的强调句型：It
is/
was
+
被强调部分（通常是主语、宾语或状语）+
that/
who（当强调主语且主语指人）+
其它部分。
eg
It
was
yesterday
that
he
met
Li
Ping
2、一般疑问句的强调句型：同上，只是把is/
was提到it前面。
eg
Was
it
yesterday
that
he
met
Li
Ping
3、特殊疑问句的强调句型：被强调部分（通常是疑问代词或疑问副词）+
is/
was
+
it
+
that/
who
+
其它部分？
eg
When
and
where
was
it
that
you
were
born
4、强调句例句：针对I
met
Li
Ming
at
the
railway
station
yesterday句子进行强调。
强调主语：It
was
I
that
(who)
met
Li
Ming
at
the
railway
station
yesterday
强调宾语：It
was
Li
Ming
that
I
met
at
the
railway
station
yesterday
强调地点状语：It
was
at
the
railway
station
that
I
met
Li
Ming
yesterday
强调时间状语：It
was
yesterday
that
I
met
Li
Ming
at
the
railway
station
5、注意：构成强调句的it本身没有词义；强调句中的连接词一般只用that,
who，即使在强调时间状语和地点状语时也如此，that,
who不可省略；强调句中的时态只用两种，一般现在时和一般过去时。原句谓语动词是一般过去时、过去完成时和过去进行时，用It
was
…
，其余的时态用It
is
…
。
（二）not
…
until
…
句型的强调句
1、句型为：It
is/
was
not
until
+
被强调部分
+
that
+
其它部分
eg
普通句：He
didn’t
go
to
bed
until/
till
his
wife
came
back
强调句：It
was
not
until
his
wife
came
back
that
he
went
to
bed
2、注意：此句型只用until，不用till。但如果不是强调句型，till,
until可通用；因为句型中It
is/
was
not
…
已经是否定句了，that后面的从句要用肯定句，切勿再用否定句了。
（三）谓语动词的强调
1、It
is/
was
…
that
…
结构不能强调谓语，如果需要强调谓语时，用助动词do/
does或did。
eg
Do
sit
down
务必请坐。
He
did
write
to
you
last
week
上周他确实给你写了信。
Do
be
careful
when
you
cross
the
street
过马路时，务必（千万）要小心啊！
2、注意：此种强调只用do/
does和did
，没有别的形式；过去时用did
，后面的谓语动词用原形。
It
be
时间段
before
从句
：多久之后才
It
will
be
一段时间before
一般现在
：将来过多久才
It
was
一段时间before
过去时
：不久就
it's
when
没什么特殊用法
给你造个句子吧
it's
3
o'clock
when
he
gets
home
it: 人称代词 “它” 特指
例 give it to me (特指，前文提及 或两个人都知道)
that：指示代词 “那个”特指
例 give that to me (同上)
one：不定代词 “一个” 泛指，随便哪一个
例： give me one (泛指，任意一个)
it is that 强调句用法如下：
当需要强调句中的主语，宾语和状语时，常用强调句：it is/was+ 被强调的部分 ＋that/who
He bought three books in the bookstore yesterday
强调主语：
It was he that/who bought three books in the bookstore yesterday
强调宾语：
It was three books that he bought in the bookstore yesterday
强调状语：
It was in the bookstore that he bought three books yesterday
扩展资料
1、陈述句的强调句型
It is/ was + 被强调部分（通常是主语、宾语或状语）+ that/ who（当强调主语且主语指人）+ 其他部分。
例如：It was yesterday that he met Li Ping 昨天他遇到了李平。
2、 一般疑问句的强调句型
It is/ was + 被强调部分（通常是主语、宾语或状语）+ that/ who（当强调主语且主语指人）+ 其他部分。同上，只是把is/ was提到it前面。
例如：Was it yesterday that he met Li Ping 昨天他遇到了李萍吗？
3、特殊疑问句的强调句型
被强调部分（通常是疑问代词或疑问副词）+ is/ was + it + that/ who + 其他部分？
例如：When and where was it that you were born 你何时何地出生？
4、not … until … 句型的强调句
句型为：It is/ was not until + 被强调部分 + that + 其他部分；此句型只用until，不用till。但如果不是强调句型，till, until可通用；因为句型中It is/ was not 已经是否定句了，that后面的从句要用肯定句，切勿再用否定句了。
普通句：He didn't go to bed until/ till his wife came back 强调句：It was not until his wife came back that he went to bed
5、谓语动词的强调
It is/ was that 结构不能强调谓语，如果需要强调谓语时，用助动词do/ does或did
例如：Do sit down 务必请坐。Do be careful when you cross the street 过马路时，务必（千万）要小心啊！
此种强调只用do/ does和did，没有别的形式；过去时用did，后面的谓语动词用原形。
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