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1、Unit 3 A healthy life Section Grammar-it的用法（1）语法图解探究发现It is a beautiful day here and I am sitting under the big tree at the end of the garden.Your mother tells me that you started smoking some time ago and now you are finding it difficult to give itup.It is never too late to mend.It is no use talkin
2、g to them.It is said that he stole the money.I think it difficult to learn English well. We make it clear that speaking to the teacher in that way is not polite. I dont like itwhen people talk with the mouth full of food.我的发现(1)句it表示天气，句第一个it代替to_give_it_up作形式宾语；第二个it代替句中所说的“吸烟”的事。(2)在句中it用作形式主语，其中句
3、用在“It is形容词(for/ofsb.)动词不定式(短语)”中，it指代动词不定式(短语)；句用在“It isno use/good动名词(短语)”中，it指代动名词(短语)；句用在“It issaid/believed/reportedthat从句”中，it指代that从句。(3)在句中it用作形式宾语，其中句用在“动词it形容词动词不定式(短语)”中，it指代动词不定式(短语)，句用在“动词it形容词that从句”中，指代that从句；句it用在某些特殊的句式中，指代when从句。一、it用作人称代词和非人称代词1用作人称代词(1)it用来指代前面的名词或前面提到过的事。My frie
4、nd offered me a beautiful gift yesterday, and I like it very much.我朋友昨天给了我一件漂亮的礼物，我非常喜欢。(2)指代性别不明的child或baby。His sister has given a birth to a baby recently and itis very beautiful.他姐姐最近生了个孩子，很漂亮。(3)指代未出场的身份不明确的人。Who is waiting for you at the bus stop?I have no idea.Itmay be my brother.谁在车站等着你？不知道，可
5、能是我哥哥。(4)替代前文中的this, that。This is your plan? Will you hand it in?这是你的计划？你要交上去吗？2用作非人称代词it用作无人称的主语，不指物，而表示时间、天气、气候、季节、距离等自然现象，或指事物的状态。It is a fine day today, isnt it?今天是个好天气，对吧？Itis five kilometers to the town from the village.从农村到城镇有10里路。Its ten oclock. 十点钟了。 即时演练1匹配下面it的用法A指代前面的名词B指代性别不明的child或baby
6、C指代未出场的身份不明确的人D时间E距离Whos that at the door?Itis the milkman. _C_Qingdao is a beautiful city, isnt it? _A_The baby is crying. It might be hungry. _B_What a long way it is from Beijing to London! _E_It was nearly midnight when she came back. _D_二、it用作形式主语it常代替由不定式、动词的ing形式或从句表示的真正主语，作形式主语，而将真正的主语移至句子的后
7、面。1代替不定式短语作形式主语It is impossibleto get there by boat.坐船不可能到那里。Its very kind of you to help me.你帮助我真好。2代替动名词短语作形式主语 常用于以下结构中：Its no use/no good/no fun/useless/a waste of time doing sth.做某事没有用/没有好处/没有意思/没有用/浪费时间。It is no use giving him some advice.It is useless giving him some advice.给他提建议没用。3代替主语从句作形式
8、主语It is necessary that the work should be done well.这项工作应该被完美完成是必须的。Its a pity thatI didnt think of it earlier.我没有早一点这么想真是遗憾。4注意以下固定句型It seems(ed)/appears(ed) that .似乎It (so) happened that . 碰巧It turns(ed) out that . 结果是It occurred to sb. that . 某人突然想起It is said/reported/believed/hoped/wellknown/sug
9、gested . that .据说/据报道/大家都相信/人人都希望/大家都知道/有人建议It so happened thatthe tickets were sold out.碰巧票都卖光了。It occurred to her that she might adopt a homeless child.她突然想到她可以收养一个无家可归的孩子。It turns out that the situation is quite serious.结果表明情况很严峻。即时演练2补全句子(2015四川高考满分作文)I badly need to improve my oral English, so
10、it_is_great_for_me_to_find a native speaker to learn from.我急需提高我的英语口语，因此对我来说找到一个可以向他学习的当地人真是太好了。(2014重庆高考满分作文)It_is_true_that a smartphone plays an important role in our daily life.真的，智能手机在我们日常生活中扮演重要的角色。It_is_no_use_trying to solve the problem by force. Peace talks are the only solution.试图用武力解决问题是没
11、用的，和谈才是唯一的办法。It_was_said_that the typhoon had caused a lot of damage. 据说台风已造成了很多的破坏。 三、it用作形式宾语it常可代替不定式(短语)、动名词(短语)或从句在句子中作形式宾语，而将真正的宾语放在句子后面，it作形式宾语常用于以下几种情况：1动词it形容词/名词(for/of)to do/从句They consideredit important to have the work done on time. 他们认为按时完成这项工作很重要。We makeita rule to visit the old every
12、 weekend.我们规定每个周末都去拜访那些老人们。2动词itno good/no use/useless/a waste of time/worth ones while等doing .Ill make it worth your while telling me about his secret.告诉我他的秘密，我会酬谢你的。Hethought it no use trying to convince them. 他认为企图说服他们没有用。 3动词it介词短语that . owe it to sb. that .把归功于take it for granted that . 想当然/认为是
13、当然的 He owes it to his doctors care thathe is quite well again. 多亏医生的照料，他身体又好起来了。4动词appreciate/hate/love/like/dislike后面接if 或when引导的从句作宾语时，中间需用形式宾语it，构成“appreciate/hate/love/like/dislikeitif/when从句”。He will appreciate it if they will invite him.如果他们邀请他，他将非常感激。She hates it when he bragged that he was t
14、he most important.她讨厌他自吹自己最重要。即时演练3补全句子First of all, I think_it_very_important_to_make_more_friends abroad.首先，我认为在国外多交朋友是非常重要的。(2014山东高考改编)Susan made_it_clear_to_me_that she wished to make a new life for herself.苏珊明确向我表明，她想为自己谋得一份新生活。(2014陕西高考改编)Id_appreciate_it_if you could let me know in advance w
15、hether or not you will come.如果你能让我提前知道你是否能来，我会很感激的。I think_it_no_use_arguing with him.我认为和他争论是没有用的。We all take_it_for_granted_that Mile can succeed.我们都想当然地认为米莱能成功。.单句语法填空1New technologies have made it easier to enjoy life than ever before. 2You may depend on it that they will look after your daughter when you are away.3From the teacher
