Unit 4 Breaking Boundaries Grammar(课件)高二英语选择性必修第二册
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①It is clear that he told a lie.
②It is natural that she knows everything about it.
③It was surprising that she passed the difficult exam.
类型
（2）it + be + 名词 + 从句
It as an empty subject It 作形式主语
3. 常见句型
3. 常见句型
it作为形式主语的常见句型： （1）It is clear / obvious / true / possible / certain / … that…
It is obvious that he’s late.
学以致用
用“it作形式主语”结构，改写下列句子。
3. Obviously, the old scientist doesn’t care much about money or fame.
_It_i_s_o_b_v_i_o_u_s_t_h_a_t_t_h_e_o_l_d__s_c_ie_n_t_is_t_d_o__e_s_n_’t_c_a_r_e_______ _m_u_c_h__a_b_o_u_t_m__o_n_e_y_o__r _fame.
（7）It doesn’t matter whether / if …
It doesn’t matter if you miss the bus, because there’s another one 15 minutes later.
（8）It looks /seems as if …
It looks as if he is wrong.
类型
二、it代表动名词 （1）it代表动名词，以“be+形容词”作谓语。
①It is pleasant sitting here.
②It is good hearing English spoken.
③It is terribly tiring working late like this.
类型
P41 1
1. I felt it was my duty as a doctor to go there and offer my help. 2. It is so inspiring to have colleagues like Wilton, Maisy, Alfonso, not to mention all the others I have worked with. 3. In a world still facing so many problems, it is absolutely essential for us all to collaborate to create a global community with a shared future of peace and prosperity.
（9）It + be + adj. + of sb + to do… It + be + adj. + for sb + to do
① It is kind of you to think so much f
us.
形容词为描述人品 质及性格特征的词。
② It's nice of you to help me.
外研版高中英语新教材选择性必修第二册 Unit 4
Breaking boundaries
It as an empty subject
When a flash flood warning is issued,
It is wise to follow the instructions of the local authorities.
①It is difficult to translate the book.
②It is important to understand the rules.
③It is helpful to study Chinese.
类型
（2）it+be + 名词 + 不定式
①It is my honour to help you.
（2）it代表动名词，以“be+名词”作谓语。
①It is great fun sailing a boat.
②It is no use/a waste of time crying for spilt milk.
链接真题
类型 三、it代表从句
it代表从句，具体可以分为四种类型： （1）it + be + 形容词 + 从句
It as an empty subject It 作形式主语
2. 类型
类型
形式句真正主语由什么结构承担？
• 通常it代替不定时、动名词、从句充当主语，起到一个 平衡句子结构，避免句子头重脚轻的作用。
类型
一、it代表不定式
it代表不定式，又可以分为四种类型： （1）it + be + 形容词 + 不定式
学以致用
用“it作形式主语”结构，改写下列句子。
2. Her book is said to have been translated into more than 3 languages. _I_t _is__s_a_id__th_a_t__h_e_r_b_o_o_k__h_a_s_b_e_e_n__t_ra_n_s_l_a_t_e_d____ _i_n_to__m_o__re__th_a_n__3__la_n_g_u_a_g__e_s_. ______________
It is reported that a fourteen-year-old girl won the game.
（4） It is suggested / ordered / required /…that... (should) do...
It is suggested that the meeting (should) be put off.
学以致用
用“it作形式主语”结构，改写下列句子。
4. The baby seems to be getting more curious about everything around him.
_I_t_s_e_e_m_s__t_h_a_t _th_e__b_a_b_y__is__g_e_tt_in_g__m__o_re__c_u_r_io_u_s_____ about everything around him.
类型
（4）it + be/其他系动词 + 从句
①It may be/seems that he views the issue from a different perspective.
②It may seem that you’re wasting your life away.
链接真题
1. (2020•江苏卷）__It___ is not a problem whether we can win the battle; it’s just a matter of time.
②It was her duty to clean the room.
③It is a pleasure to have been working with you in the past week.
类型
（3）it + be + 介词短语 + 不定式
①It was against my principle to do that.
①It is a pity that you can't come. ②It is a good start that you made a plan.
类型
（3）it + 动词的被动语态 + 从句
①It is said that he is friendly.
②It is reported that the temperature will decline sharply in one or two days.
To follow the instructions of the loacal authorities is wise.
to follow the instructions of the loacal authorities 是真正的主语
It as an empty subject It 作形式主语
（2）It is important / necessary/ right / strange / natural / …that… (should) do…
It is necessary that you do enough exercises before the race.
（3）It is said / reported / learnt / …that…
②It was beyond my ability to finish the job on time.
类型
（4）it + 及物动词 + 宾语 + 不定式
①It cost 150 yuan to buy the dress.
②It takes me 30 minutes to get to school every day.
学以致用
用“it作形式主语”结构，改写下列句子。
1. David won first place in the maths contest. What a surprise! _I_t’_s_a__s_u_rp__ri_s_e_t_h_a_t_D_a_v_i_d_w__o_n__fi_rs_t_p__la_c_e__in__th_e__ maths contest.
链接真题
链接真题
链接真题
(2019•新课标III卷）On our way to the house, it was raining so hard that we couldn't help wondering how long it would take __t_o_g_e_t__ (get) there. (2018•浙江卷) Many westerners who come to China cook much less than in their own countries once they realize how cheap _it__ can be to eat out.
1. 概念
概念
Look at the sentences and answer the questions. Sentence (a) and (c) are from the reading passage.
• 通常it作为形式主语，在句中没有实际意义，只是满足 语法需要，起到一个平衡句子结构，避免句子头重脚轻的 作用。
概念
例句：（高考安徽卷） It is our hope that we will play a greater role in the market place and, therefore, supply more jobs.
概念
课堂练习
一、把下列的句子变成用it的形式主语句。
1. To say goodbye is difficult for me. It is difficult for me to say goodbye .
（5）It is a pity / shame / …that…
It is a pity that you didn’t see such a good film.
（6）It happens / seems / looks /appears /…that…
It happens that I know him.
常用的形容词有 clever/
③ It's dangerous for us to swimfnoicoeli/spho/lgitoeo/kdi/nd等。
2. Playing too many computer games is a waste of time. It is a waste of time playing too many computer games.
3.That he is clever is obvious. It is obvious that he is clever.
②It is natural that she knows everything about it.
③It was surprising that she passed the difficult exam.
类型
（2）it + be + 名词 + 从句
It as an empty subject It 作形式主语
3. 常见句型
3. 常见句型
it作为形式主语的常见句型： （1）It is clear / obvious / true / possible / certain / … that…
It is obvious that he’s late.
学以致用
用“it作形式主语”结构，改写下列句子。
3. Obviously, the old scientist doesn’t care much about money or fame.
_It_i_s_o_b_v_i_o_u_s_t_h_a_t_t_h_e_o_l_d__s_c_ie_n_t_is_t_d_o__e_s_n_’t_c_a_r_e_______ _m_u_c_h__a_b_o_u_t_m__o_n_e_y_o__r _fame.
（7）It doesn’t matter whether / if …
It doesn’t matter if you miss the bus, because there’s another one 15 minutes later.
（8）It looks /seems as if …
It looks as if he is wrong.
类型
二、it代表动名词 （1）it代表动名词，以“be+形容词”作谓语。
①It is pleasant sitting here.
②It is good hearing English spoken.
③It is terribly tiring working late like this.
类型
P41 1
1. I felt it was my duty as a doctor to go there and offer my help. 2. It is so inspiring to have colleagues like Wilton, Maisy, Alfonso, not to mention all the others I have worked with. 3. In a world still facing so many problems, it is absolutely essential for us all to collaborate to create a global community with a shared future of peace and prosperity.
（9）It + be + adj. + of sb + to do… It + be + adj. + for sb + to do
① It is kind of you to think so much f
us.
形容词为描述人品 质及性格特征的词。
② It's nice of you to help me.
外研版高中英语新教材选择性必修第二册 Unit 4
Breaking boundaries
It as an empty subject
When a flash flood warning is issued,
It is wise to follow the instructions of the local authorities.
①It is difficult to translate the book.
②It is important to understand the rules.
③It is helpful to study Chinese.
类型
（2）it+be + 名词 + 不定式
①It is my honour to help you.
（2）it代表动名词，以“be+名词”作谓语。
①It is great fun sailing a boat.
②It is no use/a waste of time crying for spilt milk.
链接真题
类型 三、it代表从句
it代表从句，具体可以分为四种类型： （1）it + be + 形容词 + 从句
It as an empty subject It 作形式主语
2. 类型
类型
形式句真正主语由什么结构承担？
• 通常it代替不定时、动名词、从句充当主语，起到一个 平衡句子结构，避免句子头重脚轻的作用。
类型
一、it代表不定式
it代表不定式，又可以分为四种类型： （1）it + be + 形容词 + 不定式
学以致用
用“it作形式主语”结构，改写下列句子。
2. Her book is said to have been translated into more than 3 languages. _I_t _is__s_a_id__th_a_t__h_e_r_b_o_o_k__h_a_s_b_e_e_n__t_ra_n_s_l_a_t_e_d____ _i_n_to__m_o__re__th_a_n__3__la_n_g_u_a_g__e_s_. ______________
It is reported that a fourteen-year-old girl won the game.
（4） It is suggested / ordered / required /…that... (should) do...
It is suggested that the meeting (should) be put off.
学以致用
用“it作形式主语”结构，改写下列句子。
4. The baby seems to be getting more curious about everything around him.
_I_t_s_e_e_m_s__t_h_a_t _th_e__b_a_b_y__is__g_e_tt_in_g__m__o_re__c_u_r_io_u_s_____ about everything around him.
类型
（4）it + be/其他系动词 + 从句
①It may be/seems that he views the issue from a different perspective.
②It may seem that you’re wasting your life away.
链接真题
1. (2020•江苏卷）__It___ is not a problem whether we can win the battle; it’s just a matter of time.
②It was her duty to clean the room.
③It is a pleasure to have been working with you in the past week.
类型
（3）it + be + 介词短语 + 不定式
①It was against my principle to do that.
①It is a pity that you can't come. ②It is a good start that you made a plan.
类型
（3）it + 动词的被动语态 + 从句
①It is said that he is friendly.
②It is reported that the temperature will decline sharply in one or two days.
To follow the instructions of the loacal authorities is wise.
to follow the instructions of the loacal authorities 是真正的主语
It as an empty subject It 作形式主语
（2）It is important / necessary/ right / strange / natural / …that… (should) do…
It is necessary that you do enough exercises before the race.
（3）It is said / reported / learnt / …that…
②It was beyond my ability to finish the job on time.
类型
（4）it + 及物动词 + 宾语 + 不定式
①It cost 150 yuan to buy the dress.
②It takes me 30 minutes to get to school every day.
学以致用
用“it作形式主语”结构，改写下列句子。
1. David won first place in the maths contest. What a surprise! _I_t’_s_a__s_u_rp__ri_s_e_t_h_a_t_D_a_v_i_d_w__o_n__fi_rs_t_p__la_c_e__in__th_e__ maths contest.
链接真题
链接真题
链接真题
(2019•新课标III卷）On our way to the house, it was raining so hard that we couldn't help wondering how long it would take __t_o_g_e_t__ (get) there. (2018•浙江卷) Many westerners who come to China cook much less than in their own countries once they realize how cheap _it__ can be to eat out.
1. 概念
概念
Look at the sentences and answer the questions. Sentence (a) and (c) are from the reading passage.
• 通常it作为形式主语，在句中没有实际意义，只是满足 语法需要，起到一个平衡句子结构，避免句子头重脚轻的 作用。
概念
例句：（高考安徽卷） It is our hope that we will play a greater role in the market place and, therefore, supply more jobs.
概念
课堂练习
一、把下列的句子变成用it的形式主语句。
1. To say goodbye is difficult for me. It is difficult for me to say goodbye .
（5）It is a pity / shame / …that…
It is a pity that you didn’t see such a good film.
（6）It happens / seems / looks /appears /…that…
It happens that I know him.
常用的形容词有 clever/
③ It's dangerous for us to swimfnoicoeli/spho/lgitoeo/kdi/nd等。
2. Playing too many computer games is a waste of time. It is a waste of time playing too many computer games.
3.That he is clever is obvious. It is obvious that he is clever.