2021英语外研版选择性必修第四册课件：Unit 2 教学知识细解码
1．possession n．财产，财物；具有，拥有；持有违禁物品
①She was charged with possession.
持有违禁物品
②The possession of a passport is essential for foreign travel.
具有/拥有
③He lost all his possessions in the fire.
[例 2] I don't think you appreciate how expensive it will be. 我想你不了解它会有多昂贵。 [造句] 我们没有充分认识到他的病情很严重。 We didn't fully appreciate that he was seriously ill.
[造句] 事实远非如此。 It is far from the truth.
[知识拓展] far from＋n./adj. far from doing sth. far from it
离……很远；远离；远非…… 决不会做某事 完全相反；远非如此
[即学即练] 单句语法填空 ①Your exam results are far from satisfactory.It's time for you to double your effort. ②Far from improving (improve)the situation，you have just made it worse.
知识要点5 [教材 P15] Despite its widespread recognition，my first impression was that Tuesdays with Morrie is just made up of a collection of over-emotional thoughts and messages，many of which are repeated.
当莫里预见到自己的死亡时，他仿佛用新的眼睛观察一切——他 周围的事物似乎比以往任何时候都更加美丽，并有了新的含义。
[例 1] At the time we couldn't have anticipated the result of our campaigning.
那时我们不可能预料到我们这项运动的结果。 [例 2] I anticipated(that there would be) trouble. 我预料会有麻烦。 [造句] 我预料会下雨，所以带了雨伞。
health. ③A private collector possesses the oil painting.
→The oil painting is in the possession of a private collector. →A private collector is in possession of the oil painting. →A private collector takes/has possession of the oil painting.
[即学即练] 单句语法填空/句型转换
①We need to repair our possessions(possession)instead of throwing them
away.
②Although he doesn't have much money，he is possessed (possess)of good
知识要点2 anticipate v．预期，预料，期待；预先准备；预先 做；(还没拿到手的钱)预先用掉
[教材 P14] As Morrie anticipates his own death, he observes everything as though through new eyes — the things around him seem more beautiful than ever before and hold new meanings.
[小片段填空] With his business going on well，he at first possessed big houses and cars ； and later he took possession of stocks of different companies.Eventually，he found that everything he dreamed of was in his possession ．
3． anticipate v．预期，预料→anticipated adj.预料中的；预期 的→anticipation n．预料；预期
4．possess v．拥有；占有→ possession n．财产，财物→possessor n．拥有者；持有者
5．recognise v．识别→ recognition n．承认，认可→recognisable adj.可辨认的→ recognisably adv.可被辨认地
[例 1] The ring is one of her most treasured possessions. 这枚戒指是她最珍贵的财产之一。 [例 2] They are all my personal possessions. 这些都是我的私有财产。 [造句] 人们失去了自己的家园和所有的财物。 People had lost their homes and all their possessions .
[知识拓展] (1)be possessed of (2)possession n. in possession of in the possession of take/have possession of
具有(某种品质、能力等)
拥有，占有；(pl.)个人财产，私人物品
拥有……(主语是人) (某物)为……所有 拥有……；占有……
③He received the award in recognition of his success over the past
year.
赏识
Words and Phrases 知识要点1 far from 远非 [教材 P14] In fact，far from being a book about death，it's a book about life. 事实上，这不是一本关于死亡的书，而是一本关于生命的书。 [例 1] If you get to know him，you will find he is far from a fool. 如果你和他熟悉了，就会发现他一点也不傻。
期待(期盼)做．.... 期待(期盼) 据预测…… 预先地；期待地 预期……，期待……
[即学即练] 单句语法填空/完成句子 ①I anticipate seeing (see)you soon. ②He bought extra food in anticipation (anticipate) of more people coming than he had invited. ③ It is anticipated/expected (据预测) that many people will lost their jobs.
财产
2．recognition n．承认，认可；认出；赏识
① He glanced briefly towards her but there was no sign of
recognition.
认出
②There is a general recognition of the urgent need for reform. 认可
[知识拓展]
(1)appreciate(one's)doing sth.
欣赏/感激(某人)做某事
I would appreciate it if... 如果……，我将不胜感激
(2)appreciation n.
欣赏；感激
注意： (1)appreciate 后不能用不定式，而要用动词ing 形式作宾语。作 “感激；感谢”讲时，其宾语不能是人，只能是事或物； (2)appreciate 之后不能直接跟 if 引导的从句，要先接 it 再跟 if 从 句。like，hate，dislike，love，depend/rely on 等动词之后接 if/when 从句有类似用法。
知识要点4 possession n．财产；财物 [教材 P15] While we are living，we tend to get distracted by unimportant things，such as gathering material possessions. 当我们活着的时候，我们往往会被一些不重要的事情分散注意 力，比如收集物质财富。
知识要点3 appreciate vt.理解； 欣赏； 感激 [教材 P14] This encourages us to appreciate what we have，and to make the most of each day. 这鼓励我们珍惜我们所拥有的，并充分利用每一天。 [例 1] What I failed to appreciate was the distance between the two cities. 我没有意识到这两座城市间的距离。
Unit 2 Lessons in life
教学知识细解码
1．weak adj.虚弱的→weakly adv.虚弱地→weaken v．(使)虚弱 →weakness n．弱点；虚弱
2．pessimism n．悲观；悲观主义→pessimist n．悲观主义者→ pessimistic adj.悲观的，悲观主义的→pessimistically adv.悲观地
[小片段填空] I would like to express my sincere appreciation to you for your help.That is to say，I really appreciate your coming over to help me with my study.But I would appreciate it if you coullease.
合集下载
Unit2Understandingideas课件 外研版高中英语选择性必修第四册
Step 2 Understanding ideas
Step 2: Translate the following sentences and try to analyze their structure. 1.On discovering that Morrie is being weakened by a severe illness, Mitch starts visiting him at his house on Tuesdays. 米奇得知莫里得了重病，日渐虚弱，便每周二都去教授家看望他。 on/ upon doing 一...就
Unit 2 Lessons in life
Step 1 Starting out
Activity 1 Watch the video and answer the questions. 1. What is life compared to in this story? Life is compared to a jar. 2. What do rocks, pebbles, sand and tea represent? Rocks represent the most important things in our life. Pebbles represent the other important things we need to keep our life going. Sand represents all the little things in life. Tea represents the time when we can have a cup of tea and a talk with a good friend.
2.I think it's important for young people to know that making a lot of money won't always make them happy, or that looking different doesn't make a person abnormal! It's up to us to find out what is important in our lives and establish our own values. 我认为对于年轻人来说，重要的是明白赚很多钱并不总能带来快乐，看上去 与众不同并不代表不正常。我们应该靠自己去弄清楚生命中什么才是最重要 的并树立我们自己的价值观。 请思考：划线的that引导什么从句？可以省略吗？ 和know后面的that共同引导宾语从句；不能省略，因为及物动词后跟有两个 宾语从句时，第二个从句的that不可省略。
外研版高中英语选择性必修第四册Unit2 Section C课件
Maeterlinck 4. won
(win) the Nobel Prize in Literature in 1911.
The Blue Bird is a typical full-length play,5. which means it has several
acts and each act is composed of several scenes.Various 6._______c_haracters
答案 B
2.Why is Tyltyl reluctant to give the Blue Bird to cure his neighbour’s illness? A.Because the Blue Bird can’t cure the girl of her illness. B.Because Tyltyl is unwilling to help others. C.Because he found the Blue Bird after a lot of hard work and he cherished it very much. D.Because his neighbour’s illness can’t be cured. 答案 C
Activity 2 Skim for the main structure What is the text type of the article? It is a play.
第二步精读课文 领悟细节 Activity 3 Read the text carefully and choose the best answer 1.What does “The Happinesses” refer to in Act Ⅳ? A.A group of people named “The Happinesses”. B.The things which can bring people happiness. C.The people who are living with Tyltyl and Mytyl. D.Fictitious characters in the novel.
新教材高中英语Unit2Lessonsinlife理解课文精研读课件外研版选择性必修第四册
3．Why does Amy Wang think that the book should be on all school reading lists?
A．Because the book will be beneficial to young people. B．Because the book can tell students how to focus on their study. C．Because the book can teach young people how to make money. D．Because the book full of pictures is very interesting.
each day.
Name Opinions about the book What lessons they learnt
We should find out 4._w__h_at__is_ She thinks the book should be on all school reading _im__p_o_rt_a_n_t in our lives. She
Ⅲ.表格填空
Name Opinions about the book What lessons they learnt
The book encourages him to
Arthur He finds the book full of K 1.__jo_y__a_n_d_h_o_p_e_．
appreciate what he has，and to 2._m_a_k_e__th_e__m_o_s_t_o_f_
and finally opened her eyes to the world.
Unit2+Lessons++out课件+2022-2023学年高中英语外研版选择性必修第四册
___w_h_at__y_ou__c_an__d_o_t_o_da_y_.__________.
4 A: I’m glad you finally got here.
B: My car had a flat tyre on the
way. Anyway, ___A_ll’_s _w_e_ll _th_a_t_e_n_ds_w_e_l_l. __.
Phrases： 1. in possession of
in the possession of take possession of (charge) 2. cooperate with
Watch the video and find out what these things represent.
Pain past is pleasure. 过去的痛苦就是快乐。 Storms make trees take deeper roots. 风暴使树木深深扎根。 The shortest answer is doing. 最简单的回答就是干。 All things are difficult before they are easy. 凡事必先难后易。【放弃投机取巧的幻想。】 Good company on the road is the shortest cut. 行路有良伴就是捷径。
Period 1 starting out
词汇拓展 1. weak a.-v.___________写出5个同类构词的 2. pessimistic-反义词 _________ 3. anticipate vt-n._________ 4. possess vt-n._________ 5.normal-反义词_________ 6. recognise v.-n._________ 7. cooperate vt-n._________ 8. pure a.-n._________-反义词_________ 9. lean -过去式_________-过去分词_________ 10. instinct n.-a.__________-adv_______ 11. luxury n.-a._________
4 A: I’m glad you finally got here.
B: My car had a flat tyre on the
way. Anyway, ___A_ll’_s _w_e_ll _th_a_t_e_n_ds_w_e_l_l. __.
Phrases： 1. in possession of
in the possession of take possession of (charge) 2. cooperate with
Watch the video and find out what these things represent.
Pain past is pleasure. 过去的痛苦就是快乐。 Storms make trees take deeper roots. 风暴使树木深深扎根。 The shortest answer is doing. 最简单的回答就是干。 All things are difficult before they are easy. 凡事必先难后易。【放弃投机取巧的幻想。】 Good company on the road is the shortest cut. 行路有良伴就是捷径。
Period 1 starting out
词汇拓展 1. weak a.-v.___________写出5个同类构词的 2. pessimistic-反义词 _________ 3. anticipate vt-n._________ 4. possess vt-n._________ 5.normal-反义词_________ 6. recognise v.-n._________ 7. cooperate vt-n._________ 8. pure a.-n._________-反义词_________ 9. lean -过去式_________-过去分词_________ 10. instinct n.-a.__________-adv_______ 11. luxury n.-a._________
2022-2023学年高二英语外研版选择性必修第四册课件 u2 Using language
பைடு நூலகம்
现在 am/is/are+being The bridge is being repaired at
3
进行时 +过去分词
present.目前大桥正在维修。
过去 was/were+being They told me that the case was being
4
进行时 +过去分词
investigated.他们告诉我案子正在调查。
3.含有情态动词的被动语态 含有情态动词的被动语态由“情态动词+be+过去分词”构成。如: You might be asked to speak at the meeting. 可能请你在会上发言。 Whenever (they are) known,such facts should be reported. 这类情况一旦发现就要报告。 All the above items can be obtained from our office. 所有上述资料可向我们办公室索取。 Something must be done to stop these accidents. 必须采取某种措施以防止这些事故。 These books may be appreciated better by older children. 年龄稍大的孩子可能更会喜欢这些书。
将来时 过去分词
过去 would/should 8
将来时 be+过去分词
例句 He asked if Mary had been sent to hospital.他问玛丽是否已被送进医院。 Check carefully,so any mistakes will be caught.仔细检查一遍,把所有错 误都找出来。 He knew he would be punished for it.他知道他会为此受到惩罚。
现在 am/is/are+being The bridge is being repaired at
3
进行时 +过去分词
present.目前大桥正在维修。
过去 was/were+being They told me that the case was being
4
进行时 +过去分词
investigated.他们告诉我案子正在调查。
3.含有情态动词的被动语态 含有情态动词的被动语态由“情态动词+be+过去分词”构成。如: You might be asked to speak at the meeting. 可能请你在会上发言。 Whenever (they are) known,such facts should be reported. 这类情况一旦发现就要报告。 All the above items can be obtained from our office. 所有上述资料可向我们办公室索取。 Something must be done to stop these accidents. 必须采取某种措施以防止这些事故。 These books may be appreciated better by older children. 年龄稍大的孩子可能更会喜欢这些书。
将来时 过去分词
过去 would/should 8
将来时 be+过去分词
例句 He asked if Mary had been sent to hospital.他问玛丽是否已被送进医院。 Check carefully,so any mistakes will be caught.仔细检查一遍,把所有错 误都找出来。 He knew he would be punished for it.他知道他会为此受到惩罚。
2021英语外研版选择性必修第四册课件Unit 3教学知识细解码
句中作主语或宾语。 (4)the reason that... 表示“……的原因”， that 后接同位语从句，解释其内容。 (5)the reason for……的原因
(3)the reason that/which... 表示“……的原因”， that/which 引
导定语从句，并在定语从句中作主语
[小片段填空] The little boy had much difficulty hiding the truth from his parents，so he found a hiding place in the trees to keep himself hidden from them.
有进行时态，也没有被动形式。常用其现在分词形式作后置定语。
[即学即练] 单句语法填空/完成句子 ①The old town dates (date)back to the late seventeenth century. ②The fact is that your passport has been out of date，so you can't use it. ③Everyone should keep on getting himself educated so as to be up to date with modern technology. ④We are visiting an old garden dating from the 12th century (起 源于 12 世纪)．
[知识拓展]
(1)date from＝date back to 起源于；追溯到
(2)set a date for
确定……的日期
have a date with sb.
(3)the reason that/which... 表示“……的原因”， that/which 引
导定语从句，并在定语从句中作主语
[小片段填空] The little boy had much difficulty hiding the truth from his parents，so he found a hiding place in the trees to keep himself hidden from them.
有进行时态，也没有被动形式。常用其现在分词形式作后置定语。
[即学即练] 单句语法填空/完成句子 ①The old town dates (date)back to the late seventeenth century. ②The fact is that your passport has been out of date，so you can't use it. ③Everyone should keep on getting himself educated so as to be up to date with modern technology. ④We are visiting an old garden dating from the 12th century (起 源于 12 世纪)．
[知识拓展]
(1)date from＝date back to 起源于；追溯到
(2)set a date for
确定……的日期
have a date with sb.
2021英语外研版选择性必修第四册课件Unit 2(付,245页)
第四步：核查成文 核查连贯性，优先考虑使用最短连接词(but，then，later，finally， besides，thus，therefore，yet，however)；核查标点和语法；核查词 数，并最终连句成文。
[注意事项] 1．词数要限制在 60 左右。 2．要根据文章的体裁特点进行概要写作。 3．人称和时态要与所给文章中的人称和时态保持一致，但必要 时也可变换成第三人称。 4．写作时尽可能地使用自己的语言，不得照搬照抄原文。
—Laski ——拉斯基 —Seneca ——塞涅卡
4．Don't waste life in doubts and fears.
—Emerson
不要把生命浪费于怀疑与恐惧中。
——爱默生
5．Life is a precious thing，death is the greatest evil. —Henie
阅读语篇时，根据不同的文体可采取以下方法归纳主旨大意： 圈出记叙文的六要素(who，when，where，what，how，why)；
记叙文 如果是夹叙夹议文，还要写出故事给读者带来的启示或寓意
说明文 找出文章要说明的对象、观点或建议 议论文 提取议论文的三要素(论点、论据、结论)
第二步：提炼关键词 1．结合主旨大意，细读段落，找出每个段落的主旨句和关键词， 区别段落中哪些是 main ideas，哪些是 supporting ideas，examples 和 additional information。通常是在相对重要的句子中提炼关键词。正确 的关键词和关键句是概要写作最重要的内容和依据。
[写作步骤] 第一步：归纳主旨大意(含段落大意) 1．概要写作的第一步便是阅读短文并抓取主题，进而提取主旨 大意，即有关该主题的主要内容或作者在该主题上的观点或主张。归 纳主旨大意，是为了整体上把握语篇要义，有利于区分主次、剔除细 节信息。
[注意事项] 1．词数要限制在 60 左右。 2．要根据文章的体裁特点进行概要写作。 3．人称和时态要与所给文章中的人称和时态保持一致，但必要 时也可变换成第三人称。 4．写作时尽可能地使用自己的语言，不得照搬照抄原文。
—Laski ——拉斯基 —Seneca ——塞涅卡
4．Don't waste life in doubts and fears.
—Emerson
不要把生命浪费于怀疑与恐惧中。
——爱默生
5．Life is a precious thing，death is the greatest evil. —Henie
阅读语篇时，根据不同的文体可采取以下方法归纳主旨大意： 圈出记叙文的六要素(who，when，where，what，how，why)；
记叙文 如果是夹叙夹议文，还要写出故事给读者带来的启示或寓意
说明文 找出文章要说明的对象、观点或建议 议论文 提取议论文的三要素(论点、论据、结论)
第二步：提炼关键词 1．结合主旨大意，细读段落，找出每个段落的主旨句和关键词， 区别段落中哪些是 main ideas，哪些是 supporting ideas，examples 和 additional information。通常是在相对重要的句子中提炼关键词。正确 的关键词和关键句是概要写作最重要的内容和依据。
[写作步骤] 第一步：归纳主旨大意(含段落大意) 1．概要写作的第一步便是阅读短文并抓取主题，进而提取主旨 大意，即有关该主题的主要内容或作者在该主题上的观点或主张。归 纳主旨大意，是为了整体上把握语篇要义，有利于区分主次、剔除细 节信息。
外研版高中英语选择性必修第四册精品课件 Unit 2 Section A
Section A Starting out & Understanding ideas
Unit 2
英语
内容索引
基础落实•必备知识全过关 语篇研读•文本脉络全明晰 重难探究•能力素养全提升
基础落实•必备知识全过关
Ⅰ.重点单词
必记写作词汇 abnormal adj.不正常的,反常的
识记阅读词汇 widespread adj. 广泛流传的
远非
8.be reunited with (使)重聚
9.live life to the full 充分地享受生活
10.a pleasant surprise
意外惊喜
11.point of view
观点,态度,看法
语篇研读•文本脉络全明晰
Step Oneg for the main structure
串记拓展词汇
1.weaken v.(使)虚弱→ weak
adj.虚弱的→ weakness n.弱点
2.pessimism n.悲观;悲观主义→ pessimist n.悲观主义者
→ pessimistic adj.悲观的,悲观主义的
3.anticipate v. 预期,预料→ anticipation n.预料,预期
made him value his own life more,4. encouraging (encourage) him to
appreciate what we have and make the most of each day.Amy Wang thinks this
book should be on all school reading lists.It has given her 5. a
Unit 2
英语
内容索引
基础落实•必备知识全过关 语篇研读•文本脉络全明晰 重难探究•能力素养全提升
基础落实•必备知识全过关
Ⅰ.重点单词
必记写作词汇 abnormal adj.不正常的,反常的
识记阅读词汇 widespread adj. 广泛流传的
远非
8.be reunited with (使)重聚
9.live life to the full 充分地享受生活
10.a pleasant surprise
意外惊喜
11.point of view
观点,态度,看法
语篇研读•文本脉络全明晰
Step Oneg for the main structure
串记拓展词汇
1.weaken v.(使)虚弱→ weak
adj.虚弱的→ weakness n.弱点
2.pessimism n.悲观;悲观主义→ pessimist n.悲观主义者
→ pessimistic adj.悲观的,悲观主义的
3.anticipate v. 预期,预料→ anticipation n.预料,预期
made him value his own life more,4. encouraging (encourage) him to
appreciate what we have and make the most of each day.Amy Wang thinks this
book should be on all school reading lists.It has given her 5. a
新教材高考英语一轮复习教材知识解读选择性必修第四册Everydayeconomics课件外研版ppt
7. This autumn, 6，000 residents will participate in the first _p_h_as_e_
(阶段) of the project.
[词汇变形]根据汉语释义写出单词及其变化形式
1. _p_o_t_e_n_ti_a_l _ adj. 有 潜 力 的 n. ( 事 物 的 ) 潜 力 ， 可 能 性 拓 →__p_o_te_n_t_ia_l_ly__ adv. 潜在地 展
(更远的地方)． 核 5. We could put some of the pictures over on that _b_la_n_k_ (空白的) 心 wall over there. 单 6. Your intake of alcohol shouldn't _e_x_ce_e_d_ (超过) two units per 词 day.
4. He was so _f_ru_s_t_ra_t_e_d__ that he cried with anger and f_r_u_st_r_a_ti_o_n_.
In fact, it's healthier to release _f_ru_s_t_ra_t_e_d__ feeling than to bottle 拓
5. _e_q_u_a_to_r_ n. 赤道
核 6. _s_u_p_er_i_o_r_ adj. 质量上乘的，优质的 心 7. _s_u_b_je_c_t_iv_e__ adj. 主观的 单 8. h_i_r_e_ v. (短期的)租用，租借 词 9. _a_b_u_se_ n. 滥用
10. _th_e_f_t_ n. 偷窃，偷盗
01
必备知识•素养构建
单词 拼写应用 短语 多维运用 句式 结构仿写
(阶段) of the project.
[词汇变形]根据汉语释义写出单词及其变化形式
1. _p_o_t_e_n_ti_a_l _ adj. 有 潜 力 的 n. ( 事 物 的 ) 潜 力 ， 可 能 性 拓 →__p_o_te_n_t_ia_l_ly__ adv. 潜在地 展
(更远的地方)． 核 5. We could put some of the pictures over on that _b_la_n_k_ (空白的) 心 wall over there. 单 6. Your intake of alcohol shouldn't _e_x_ce_e_d_ (超过) two units per 词 day.
4. He was so _f_ru_s_t_ra_t_e_d__ that he cried with anger and f_r_u_st_r_a_ti_o_n_.
In fact, it's healthier to release _f_ru_s_t_ra_t_e_d__ feeling than to bottle 拓
5. _e_q_u_a_to_r_ n. 赤道
核 6. _s_u_p_er_i_o_r_ adj. 质量上乘的，优质的 心 7. _s_u_b_je_c_t_iv_e__ adj. 主观的 单 8. h_i_r_e_ v. (短期的)租用，租借 词 9. _a_b_u_se_ n. 滥用
10. _th_e_f_t_ n. 偷窃，偷盗
01
必备知识•素养构建
单词 拼写应用 短语 多维运用 句式 结构仿写
外研版高中英语选择性必修第四册Unit3 Section Ⅱ Using language讲义
Section ⅡUsing language1．give an account of 描述take... into account把……考虑在内on account of... 因为，由于on no account 决不(置于句首时，句子要用部分倒装)①She was told to wear flat shoes, ________ account of her back problem.②She did very well on the test when you take ________ account how little she studied.③我们决不能容忍对儿童的暴力行为。
On no account ____________ violence against children.2．on the whole基本上，大体上；总的来说进行总结时用以引出自己的观点或理由的表达，常见的有：as a whole总的来说in general 通常，总的来说to sum up 总之，概括地说in short 简言之，总之in summary 总之，概括起来in a word 总之，简言之in conclusion 总之，最后in brief 简言之to conclude 最后，总之①When I look back on my life, what strikes me is that I have been ________ a wholea very lucky man, above all, lucky in my friends.②_________short, I like online reading more than paper reading.③大体上，我赞成这个想法。
_________________________________________，I'm in favour of the idea.P381．____________________ 和……混合/结合2．____________________ 一位出生于法国的华裔美国籍大提琴家3．____________________ “丝绸之路”的根本宗旨4．____________________ 来自全世界5．____________________ 从整体上P391．____________________ 中国高铁2．____________________ 取得突破3．____________________ 为……提供可靠记载4．____________________ 把……从……翻译成……5．____________________ 中国和其他国家的文化交流P401．____________________ 对……有浓厚的兴趣2．____________________ 对……的喜欢3．____________________ 被……录取4．____________________ 外文系5．____________________ 除……之外(还)6．____________________ 许多7．____________________ 在……方面是专家8．____________________ 使……更容易为……所了解9．____________________ 孔子学院10．____________________ 非营利性教育机构11．____________________ 旨在做……P411．____________________ 任教2．____________________ 起初，刚开始3．____________________ 与……互动/交往4．____________________ 总而言之5．____________________ 简言之复习状语从句一、时间状语从句1．when，while与as引导的时间状语从句连词从句谓语动词用法when延续性动词或非延续性动词从句的动作和主句的动作可以同时发生，也可以先后发生while延续性动词从句的动作与主句的动作同时发生as延续性动词强调主从句动作相伴发生，意为“一边……一边……；随着……”金属受热时膨胀。