(
课件网) Unit 8 Green Earth Our earth needs everyone’s protection. The Usage of It Proverbs with 'it' ①It is never too old to learn. 活到老, 学到老。 ②It is easier to fall than to rise. 摔倒容易爬起来难。 ③It is no use crying over spilt milk. 覆水难收。 it 用作代词 The Usage of It 1. 上文提到的物： 2. 上文提到的事： 3. 性别不明的婴儿： 4. 天气、温度、时间、距离、日期等： I have a cat. It is cute. She fell over yesterday. It hurt her a lot. Is it a boy or a girl What season is it It is spring. it 用作形式主语 it 作形式主语 真正主语：to protect the environment 当动词不定式、动名词或一个句子充当主语时，会使句子失去平衡，显得“头重脚轻”，故it放在句首充当句子的形式主语，而把动词不定式、动名词或从句放到句末做句子的真正主语，以达到句子的平衡。 E.g:It is important for us to protect the environment. 对我们来说，保护环境是重要的。 it 用作形式宾语 句型： 动词+宾语+宾语补足语(n. / adj.) for sb.+ to do/doing/that I think it important to practise speaking in time. I find it a good habit that we practise speaking in time. She felt it no use learning English without speaking it. it常用在动词find，think，make，feel，believe，consider 等动词后做形式宾语 it 强调句 It is now that I realize the importance of protecting the environment. 现在我才认识到保护环境的重要性。 句型： It is(was)+被强调部分+ that (who)+其余部分. 1.强调句可强调____、____、___等。 (不可强调谓语） 2.引导词____、_____ 3.be动词:____、____ 主语 宾语 状语 that who/whom(强调人) is was 谓 用it强调句改写句子 Lucy saw Jack on the street yesterday. 主 宾 地点状语 时间状语 X 强调主语 强调宾语 强调地点状语 强调时间状语 It was yesterday that Lucy saw Jack on the street. It was Lucy that /who saw Jack on the street yesterday. It was Jack that /who/ whom Lucy saw on the street yesterday. It was on the street that Lucy saw Jack yesterday. it 强调句 2.I didn’t realize the importance of protecting the environment until now. 1. Xiaohu cried because he was blamed by Mr.Li in class . It was_____ that _____. It was_____that _____ _____. 我发现： _____ 去掉It is/ was... that ,句意完整。 because he was blamed by Xiaohu in class Mr. Li cried not until now I realized the important of protecting the environment it 常见的句型 1.It is(has been)+时间段+since... 2.It was(will be)+ 时间段+before... 3.It was(will be)+时间点+when... 4.It is/was (high) time that... 5.It is the first(second/third) time that... 自从...（多久了）。 过（多久）才... 。 当...时，是...。 该做某事了。 某人第几次做某事。 it 常见的句型 It is (high)time that... 结构中要用虚拟语气，从句动词用should+动词原形（should不能省略）或动词过去式。 e.g：It is high time that you should make(made) full use of your time to go over your lessons. It is high time that he should go (went) to school. Grammar 强调句 It was not until now that I realized the importance of protecting the environment. It’s time we took actions for our next generations! It was in the park that he called on people to try garbage sorting. ... ...
