it is +被强调的部分+that从句 帮忙讲一下吧！!！！ 解析：it is/was + 被强调部分 + that 从句
it is+\u88ab\u5f3a\u8c03\u90e8\u5206+that\u4ece\u53e5It's you who helped me.\u5c31\u662f\u4f60\u5e2e\u4e86\u6211\u3002
It was yesterday that I went to the supermarket.\u5c31\u662f\u6628\u5929\uff0c\u6211\u53bb\u4e86\u8d85\u5e02\u3002
\u5f3a\u8c03\u53e5\u578b\uff1aIt +is/was +\u88ab\u5f3a\u8c03\u90e8\u5206+that/who-\u4ece\u53e5
\u82f1\u8bed\u5e38\u7528\u7684\u5f3a\u8c03\u7ed3\u6784\u662f"It is (was)+\u88ab\u5f3a\u8c03\u90e8\u5206(\u4e3b\u8bed\u3001\u5bbe\u8bed\u6216\u72b6\u8bed)+who
(that)..."\u3002\u4e00\u822c\u8bf4\u6765,\u88ab\u5f3a\u8c03\u90e8\u5206\u6307\u4eba\u65f6,\u7528who;\u6307\u4e8b\u7269\u65f6\u7528that,\u4f46that\u4e5f\u53ef\u4ee5\u6307\u4eba\u3002\u5728\u7f8e\u56fd\u82f1\u8bed\u4e2d\u6307\u4e8b\u7269\u65f6\u5e38\u7528which\u6765\u4ee3\u66ffthat\u3002
1. \u9648\u8ff0\u53e5\u7684\u5f3a\u8c03\u53e5\u578b
It is/ was + \u88ab\u5f3a\u8c03\u90e8\u5206\uff08\u901a\u5e38\u662f\u4e3b\u8bed\u3001\u5bbe\u8bed\u6216\u72b6\u8bed\uff09+ that/ who\uff08\u5f53\u5f3a\u8c03\u4e3b\u8bed\u4e14\u4e3b\u8bed\u6307\u4eba\uff09+ \u5176\u4ed6\u90e8\u5206\u3002
\u4f8b\u5b50 It was yesterday that he met Li Ping.
2. \u4e00\u822c\u7591\u95ee\u53e5\u7684\u5f3a\u8c03\u53e5\u578b
\u540c\u4e0a\uff0c\u53ea\u662f\u628ais/ was\u63d0\u5230it\u524d\u9762\u3002
\u4f8b\u5b50 Was it yesterday that he met Li Ping?
3. \u7279\u6b8a\u7591\u95ee\u53e5\u7684\u5f3a\u8c03\u53e5\u578b
\u88ab\u5f3a\u8c03\u90e8\u5206\uff08\u901a\u5e38\u662f\u7591\u95ee\u4ee3\u8bcd\u6216\u7591\u95ee\u526f\u8bcd\uff09+ is/ was + it + that/ who + \u5176\u4ed6\u90e8\u5206\uff1f
\u4f8b\u5b50 When and where was it that you were born?
4.not \u2026 until \u2026 \u53e5\u578b\u7684\u5f3a\u8c03\u53e5
A. \u53e5\u578b\u4e3a\uff1aIt is/ was not until + \u88ab\u5f3a\u8c03\u90e8\u5206 + that + \u5176\u4ed6\u90e8\u5206
\u666e\u901a\u53e5\uff1aHe didn't go to bed until/ till his wife came back.
\u5f3a\u8c03\u53e5\uff1aIt was not until his wife came back that he went to bed.
B. \u6ce8\u610f\uff1a
\u6b64\u53e5\u578b\u53ea\u7528until\uff0c\u4e0d\u7528till\u3002\u4f46\u5982\u679c\u4e0d\u662f\u5f3a\u8c03\u53e5\u578b\uff0ctill, until\u53ef\u901a\u7528\uff1b\u56e0\u4e3a\u53e5\u578b\u4e2dIt
is/ was not ... \u5df2\u7ecf\u662f\u5426\u5b9a\u53e5\u4e86\uff0cthat\u540e\u9762\u7684\u4ece\u53e5\u8981\u7528\u80af\u5b9a\u53e5\uff0c\u5207\u52ff\u518d\u7528\u5426\u5b9a\u53e5\u4e86\u3002
5.\u8c13\u8bed\u52a8\u8bcd\u7684\u5f3a\u8c03
A.
It is/ was ... that ... \u7ed3\u6784\u4e0d\u80fd\u5f3a\u8c03\u8c13\u8bed\uff0c\u5982\u679c\u9700\u8981\u5f3a\u8c03\u8c13\u8bed\u65f6\uff0c\u7528\u52a9\u52a8\u8bcddo/ does\u6216did
Do sit down. \u52a1\u5fc5\u8bf7\u5750\u3002
Do be careful when you cross the street. \u8fc7\u9a6c\u8def\u65f6\uff0c\u52a1\u5fc5\uff08\u5343\u4e07\uff09\u8981\u5c0f\u5fc3\u554a\uff01
B. \u6ce8\u610f\uff1a
\u6b64\u79cd\u5f3a\u8c03\u53ea\u7528do/ does\u548cdid\uff0c\u6ca1\u6709\u522b\u7684\u5f62\u5f0f\uff1b\u8fc7\u53bb\u65f6\u7528did\uff0c\u540e\u9762\u7684\u8c13\u8bed\u52a8\u8bcd\u7528\u539f\u5f62\u3002
\u4eb2\uff0c\u7f51\u4e0a\u8d44\u6599\uff0c\u4f60\u53c2\u8003\u53c2\u8003\u5c31\u884c\u4e86
强调句型：It +is/was +被强调部分+that/who-从句
英语常用的强调结构是"It is (was)+被强调部分(主语、宾语或状语)+who (that)..."。一般说来,被强调部分指人时,用who;指事物时用that,但that也可以指人。在美国英语中指事物时常用which来代替that。
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。
“It is/was + 被强调部分+that /who +其他”这一结构是最典型的强调结构，它的特点是去掉it was„.that这一框架后，所剩部分仍为一个完整的句子。
使用这一结构要注意
一.主谓一致
1、that \ who后面的谓语要与主句一致。
尤其需要注意的是，在强调either „or„, neither „nor „, not only„but also„等词组所构成的句子时，that或who后的谓语动词要根据就近原则。
在强调有as well as, not„but, together with, except, like等短语构成的句子时，谓语动词要与这些词前面名词数一致。
2、that或who之前的谓语动词即使被强调部分是复数含义，但仍用单数形式。
二、与疑问句的转换
1、变为一般疑问句时，直接将is (was) 置于句首构成疑问语序，回答要用it is/was。
2
、如果原句是特殊疑问句，就特殊疑问句强调时，要将疑问句词置于句首，原句中的疑问语
序也要变成陈述语序，即：疑问句 ＋is( was ) it ＋that＋其他成分。
三、强调含有“Not ..until..”结构的句子时要用“It is /was not until „that „”结构，that后的句子要用肯定句，且须用陈述句语序。
四、如果强调原因状语从句，原因状语从句的连词只能用because，不能用since或as等。
五、与定语从句的区别这一强调结构与定语从句最根本的区别就是去掉it was „.that这一框架后，所剩部分仍为一个完整的句子。它可以强调主语、宾语、时间状语、地点状语；强调时间、
地点时不能用when或where，只能用that；若时间状语、地点状语是介词短语，其中的介词绝对不能省略。
it is 人/时间/地点/原因等等+that/who +从句，其实强调句就是不要that/who还有it is都是完整的句子。例如:It is Mary who sings in the classroom强调的是Mary其中，不要it is,who就是Mary sings in the classroom.
怎么样，明白吗？
A:就是那个家伙。B:哪个？A:昨天晚上把自己丢垃圾桶里那个！😄强调句很简单啊！that后面起到说明作用，去掉仍然是完整的一句话。
It is the bag that l lost last week .
扩展阅读：it is+强调部分 that造句 ... it is my pleasure ... it+was+that强调句 ... it is that 强调句用法 ... it+is+no+use后加什么 ... it is which 强调句用法 ... s v io do ... it is强调句子 ... it isthat 强调结构 ...
