1、形式主语形式主语1. It is amazing that at my age I am still fit.2. It is said that he had passed the exam.3. It is a pity that he is ill. 4. It is easier to fall than to rise.5. It is no use crying over spilt milk.观察以下句子观察以下句子it可以放在句中代替可以放在句中代替_, _ 或或 _ 作形式主语作形式主语从句从句不定式不定式(短语）短语）动名词动名词(短语短语) 1.It is amazing
2、 that at my age I am still fit.it 作形式主语作形式主语句型结构：句型结构：It is + It is + adj. (important, necessary.) +that + sb. + (should) do sth. it it 是形式主语，真正的主语是是形式主语，真正的主语是that that 引引导的从句。导的从句。该句型中，如果形容词是该句型中，如果形容词是important,right, important,right, necessarynecessary等，等，thatthat后的从句中要用虚拟语气后的从句中要用虚拟语气（should +
3、should + 动词原形），动词原形），should should 可以省去。可以省去。It is important that we (should) learn English well. adj. + that . 2. It is said that he had passed the exam.it 作形式主语作形式主语句型结构：句型结构：It is+ 译为译为 “据说据说, ,据报道，据悉据报道，据悉”that”that引导的从句是真正引导的从句是真正 的主语的主语 done ( said, reported.) +that .3. It is a pity that he is
4、 ill.it 作形式主语作形式主语句型结构：句型结构：It is + 该句型中，该句型中，thatthat后的从句一般用虚拟后的从句一般用虚拟语气（语气（should + should + 动词原形），动词原形），shouldshould可省去可省去, ,表示出乎意料，常译为竟表示出乎意料，常译为竟然。然。 n. (a pity, a shame.)+that . 4. It is easier to fall than to rise.it 作形式主语作形式主语句型结构：句型结构：It is + it it 作形式主语，代替真正的主语作形式主语，代替真正的主语 to do sth.to d
5、o sth. adj. + to do sth.5. It is no use crying over spilt milk.it 作形式主语作形式主语句型结构：句型结构：It is + 该句型中的真正主语是动名词短语该句型中的真正主语是动名词短语, ,译为译为“做做.是没有用是没有用/ /好处的好处的”。no use/good +doing sth.1. It is + adj. + that . 2. It is + adj. (important.) +that + sb. + (should) do sth.3. It is+ done ( said.) +that . 4. It i
6、s + n. (a pity.) +that . 5. It is + adj. + to do sth.6. It is no use/good + doing sth.总结：总结：it作形式主语的常见句型作形式主语的常见句型1.We think it important to learn English.it 在句中作形式宾语在句中作形式宾语2. I would appreciate it if you could come to my birthday party.3. You may depend on it that we shall always help you.it作某些动词（
7、作某些动词（make, think, find, consider.）的宾语）的宾语某些表示某些表示“喜、怒、哀、乐喜、怒、哀、乐”的动词（的动词（like, enjoy, hate, appreciate.）往往用）往往用it作形作形式宾语，再加上式宾语，再加上if/when等引导的宾从。等引导的宾从。某些动词短语（某些动词短语（ask for, depend on, insist on.）后常用）后常用it作形式宾语。作形式宾语。为保持句子结构平衡，避为保持句子结构平衡，避免头重脚轻，常用免头重脚轻，常用it代替代替不定式、动名词或从句不定式、动名词或从句在在句中作形式宾语。句中作形式宾语
8、。Correct the sentences1. We think that our duty to clean our classroom every day. it2. You can depend on that I will keep my promise.it3. I think it no use to arguing with him.4. Id appreciate if you can give me some useful information.itit 在句中作形式宾语在句中作形式宾语Summary为了保持句子结构平衡，It在句中代替从句、不定式和动名词作形式主语或宾语 Homework:Homework: 1.Review what you have learnt today.
