外研版（2019） 选择性必修第二册 Unit 4 Breaking Boundaries Grammar it作形式主语课件(17张ppt)
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| 名称 | 外研版（2019） 选择性必修第二册 Unit 4 Breaking Boundaries Grammar it作形式主语课件(17张ppt) |  | |
| 格式 | pptx | ||
| 文件大小 | 81.8KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2022-12-20 17:04:00 | ||
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(共17张PPT)
XB2U4 Grammar
——Hilda
你学过哪些it作形式主语的句式？
it 作形式主语的用法？
主语部分相对于谓语部分而言太长，常把主语部分移到句尾，在主语位置放上it。
it 没有具体的意义，仅用于维持句子结构平衡，避免主语太长，显得头重脚轻。
it作形式主语主要有三种情况：代表不定式作形式主语、代表动名词作形式主语、代表从句作形式主语。
it 代表不定式作形式主语
It is impossible to get there by boat.
It is difficult for a foreigner to learn Chinese.
It is kind of you to help me.
It + be + adj. + to do sth.
It is adj. for sb. to do sth. & It is adj. of sb. to do sth. 两者区别？
adj.描述人的品质、品格，介词用of；adj.描述不定式所表示动作的特征，介词用for。
it 代表不定式作形式主语
It was her duty to clean the room.
It is not a good habit to stay home too late.
It + be + n. + to do sth.
it 代表不定式作形式主语
It was against my principle to do that.
It + be + p.p. + to do sth. p.p.=prepositional phrase
it 代表不定式作形式主语
It cost 150 yuan to buy the dress.
It took the workers almost three years to finish building them.
It + vt. + O. + to do sth. vt.=transitive verb O.=Object
it 代表不定式作形式主语（小结）
It + be + adj. + to do sth. (for & of 区别)
It + be + n. + to do sth.
It + be + p.p. + to do sth.
It + vt. + O. + to do sth.
it 代表动名词作形式主语
常用于以下结构中：
It + be + adj. + doing sth.
It is pleasant sitting here.
It + be + n. + doing sth.
其中常见结构有：
It is 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 crying over spilt milk.
= It is useless crying over spilt milk.
覆水难收。
it 代表从句作形式主语
it代表的从句可以用that来引导，也可以用whether /if、连接代词或连接副词引导。
It is obvious that students should get well prepared for their future.
It is doubtful whether she will be able to come.
It is a mystery to me how it all happened.
it 代表从句作形式主语
It is natural that she knows everything about it.
It is necessary that the work should be done.
It + be + adj. + that ...
it 代表从句作形式主语
It is a pity that you didn’t see such a good film.
It is our hope that in coming decades, advances in science will offer new perspectives from which to study how people manage their lives.
It + be + n. + that ...
常见于：
It is a pity/a shame/a fact/an honour/ good news/no wonder/a wonder/...+ that...
it 代表从句作形式主语
It is said that nothing has been done about it.
It is hoped that the number of deer will greatly increase very soon.
It + be done + that ...
常见于：
It is said/reported/ believed/hoped/known/suggested ... + 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 is suggested/ordered/required ...(表坚持、建议、命令、要求的动词)that S. + (should) do sth. (S.=Subject)
It is suggested that the meeting __be__(be) put off.
it 代表从句作形式主语
It may be / seems that he views the issue from a different perspective.
It seemed that I had become what my parents had wanted me to be.
It + be/其他系动词 + that ...
it 代表从句作形式主语（小结）
It + be + adj. + that ...
It is a pity/a shame/a fact/an honour/ good news/no wonder/a wonder/...+ that...
It is said/reported/ believed/hoped/known/suggested ... + that...
It + be/其他系动词 + that ...
it 作形式主语的其他固定句型
It turns(ed) out that ... 结果是……
It turns out that the situation is quite serious.
It occurs(red) to sb. that ... 某人突然想起……
It occurred to her that she might adopt a homeless child.
It doesn’t matter whether/if ... 是否……没关系
It doesn’t matter if you miss the bus, because there’s another one 15minutes later.
It looks/seems as if ... 好像……
It looks as if he is wrong.
It takes/took sb. (some time) to do sth.
It took us three hours to get there.
THANK YOU
XB2U4 Grammar
——Hilda
你学过哪些it作形式主语的句式？
it 作形式主语的用法？
主语部分相对于谓语部分而言太长，常把主语部分移到句尾，在主语位置放上it。
it 没有具体的意义，仅用于维持句子结构平衡，避免主语太长，显得头重脚轻。
it作形式主语主要有三种情况：代表不定式作形式主语、代表动名词作形式主语、代表从句作形式主语。
it 代表不定式作形式主语
It is impossible to get there by boat.
It is difficult for a foreigner to learn Chinese.
It is kind of you to help me.
It + be + adj. + to do sth.
It is adj. for sb. to do sth. & It is adj. of sb. to do sth. 两者区别？
adj.描述人的品质、品格，介词用of；adj.描述不定式所表示动作的特征，介词用for。
it 代表不定式作形式主语
It was her duty to clean the room.
It is not a good habit to stay home too late.
It + be + n. + to do sth.
it 代表不定式作形式主语
It was against my principle to do that.
It + be + p.p. + to do sth. p.p.=prepositional phrase
it 代表不定式作形式主语
It cost 150 yuan to buy the dress.
It took the workers almost three years to finish building them.
It + vt. + O. + to do sth. vt.=transitive verb O.=Object
it 代表不定式作形式主语（小结）
It + be + adj. + to do sth. (for & of 区别)
It + be + n. + to do sth.
It + be + p.p. + to do sth.
It + vt. + O. + to do sth.
it 代表动名词作形式主语
常用于以下结构中：
It + be + adj. + doing sth.
It is pleasant sitting here.
It + be + n. + doing sth.
其中常见结构有：
It is 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 crying over spilt milk.
= It is useless crying over spilt milk.
覆水难收。
it 代表从句作形式主语
it代表的从句可以用that来引导，也可以用whether /if、连接代词或连接副词引导。
It is obvious that students should get well prepared for their future.
It is doubtful whether she will be able to come.
It is a mystery to me how it all happened.
it 代表从句作形式主语
It is natural that she knows everything about it.
It is necessary that the work should be done.
It + be + adj. + that ...
it 代表从句作形式主语
It is a pity that you didn’t see such a good film.
It is our hope that in coming decades, advances in science will offer new perspectives from which to study how people manage their lives.
It + be + n. + that ...
常见于：
It is a pity/a shame/a fact/an honour/ good news/no wonder/a wonder/...+ that...
it 代表从句作形式主语
It is said that nothing has been done about it.
It is hoped that the number of deer will greatly increase very soon.
It + be done + that ...
常见于：
It is said/reported/ believed/hoped/known/suggested ... + 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 is suggested/ordered/required ...(表坚持、建议、命令、要求的动词)that S. + (should) do sth. (S.=Subject)
It is suggested that the meeting __be__(be) put off.
it 代表从句作形式主语
It may be / seems that he views the issue from a different perspective.
It seemed that I had become what my parents had wanted me to be.
It + be/其他系动词 + that ...
it 代表从句作形式主语（小结）
It + be + adj. + that ...
It is a pity/a shame/a fact/an honour/ good news/no wonder/a wonder/...+ that...
It is said/reported/ believed/hoped/known/suggested ... + that...
It + be/其他系动词 + that ...
it 作形式主语的其他固定句型
It turns(ed) out that ... 结果是……
It turns out that the situation is quite serious.
It occurs(red) to sb. that ... 某人突然想起……
It occurred to her that she might adopt a homeless child.
It doesn’t matter whether/if ... 是否……没关系
It doesn’t matter if you miss the bus, because there’s another one 15minutes later.
It looks/seems as if ... 好像……
It looks as if he is wrong.
It takes/took sb. (some time) to do sth.
It took us three hours to get there.
THANK YOU