《单元语法聚焦》Save Our World! PPT
第一部分内容：教材典据
1. It was World Environment Day.那天是世界环境日。
2. It means “garbage” in American English.
在美式英语中，它的意思是“garbage”。
3. Let's do it now. 让我们现在就做吧。
4. I think it's our duty to protect the environment.
我认为保护环境是我们的职责。
5. It is a waste to use paper only on one side.仅单面用纸是一种浪费。
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单元语法聚焦PPT，第二部分内容：语法探究
1．基本用法
(1)用作________代词，代替前面提到过的事物。例如：
This is a new dictionary. I bought it yesterday.
这是一本新词典，我昨天买的它。
(2)代替________代词，相当于this或that。例如：
—What's that？那是什么？
—It's an MP3. 它是一部MP3。
(3)表示某人(who，someone，somebody等)的身份，还可指代不明性别的人或婴儿(baby)等。例如：
Someone is coming upstairs. It must be the postman.
有人上楼来了，一定是邮递员。
—Go and see who is knocking at the door.去看看谁在敲门。
—It's Bill.是比尔。
(4)指________、距离、自然现象(天气、气候、明暗)、度量、价值等。例如：It's Sunday today.今天是星期天。
It's three months since he came here.他到这里已经三个月了。
How far is it to the Great Wall?到长城有多远？
It's getting dark.天色渐暗。
2．it的句法功能
这时的it没有词义，只是帮助改变句子结构，使句子显得平衡一些或强调某一句子成分。
(1)用作________主语。
it作形式主语时置于句首，而将作真正主语的动词不定式(短语)、动名词(短语)或主语从句放到后面。例如：
It is necessary to ask the teacher for help.向老师求助是必要的。
It hasn't been decided whether to hold a meeting this week.
本周是否召开会议还没有决定。
常用于下列句型中：
①It is ＋adj.＋(for sb.) to do sth. 意为“(对某人来说)做某事……”。例如：
It's important for us to protect the environment. 对我们来说保护环境(很)重要。
②It's time to do/for/that… 意为“到……时间了”。例如：
It's time to get up/for supper/that we go to school.是起床/吃晚饭/上学的时间了。
③It's one's turn to do sth. 意为“轮到某人做某事了”。例如：
It's your turn to answer the question.
轮到你回答问题了。
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单元语法聚焦PPT，第三部分内容：实战演练
Ⅰ. 单项填空
( )1. 2017·安徽—Is this iPad yours?
—Yes. My parents bought ________ for my language learning.
A. one B. it
C. other D. another
( )2.2017·兰州Do you think ________ acceptable for a group of women to dance to loud music on the square near your house?
A. it B. that
C. this D. its
( )3. 2017·成都改编 Mike lost his school ID card this morning.
He is looking for ________ now.
A. it B. him
C. them D. that
【解析】考查代词的用法。句意：今天早上迈克把他的学生证弄丢了。他现在正在寻找它。指代前句出现的可数名词的单数card，故用代词it。代词it指代物；him指代表示男性的人。故选A。
( )4.—________ nearly took us an hour to walk here.
—Have a drink, then. You ________ be thirsty.
A. This; may B. It; may
C. This; must D. It; must
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