【English】Please come in

A. 句中matter似应用单数matters.
这是强调句型。

看看这个你就清楚了
“It is…that-clause”可以包括若干个句式。其中容易造成混淆的有三种情况：（1）that从句为主语从句；（2）“it is…that”为强调句型；（3）that从句为定语从句。现举例如下：
（1）主语从句。
It is important that students today master English.
It is reported that China will send up a series of spaceships in the 21st century.
It is a rule that everyone should obey the State’s laws.
It happened that they were out visiting their friends.
可以看出，此类主语从句的句子成分无论是主语、谓语、宾语，还是各种状语都是完整的，并且不能称到“It is…”结构中去。这就是判别主语从句的基本点。
（2）强调句。
先举一个重点成分句：昨天我在书店看见了他。I saw him at the bookstore yesterday.
现将此句变成分别突出主语、宾语、地点及时间状语的强调句：
A、It was I that/who saw him at the bookstore yesterday.
B、It was him that I saw at the bookstore yesterday.
C、It was at bookstore that I saw him yesterday.
D、It was yesterday that I saw him at the bookstore.
比较无重点叙述对象原句和由此转换来的强调句可以看出，强调句是把原句拆散，把要强调的部分如主语、宾语、状语移到“It is…”