课件21张PPT。Unit 5 Look into Science Lesson 28
The Study of Living Things 九年级英语上 新课标 [冀教]1.Would you like to be a biologist when you grow up? Why or why not?
2.What mysteries of nature do you know about?Think about it！
New Wordsbiology butterflymigrate fantasticcompletelygrandchildmilkweedpuzzlingchemical female Read the lesson and complete the table.returnspend killfindlay restMain phrases:
·draw one’s attention
·as many as…
·leave for
·cut downRead the text and find out main phrases and sentences.
Main sentences:
·Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.
·The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north.
·When they begin to travel north in spring,the females lay eggs.
·Scientists still don’t understand how the butterflies know when to fly south.
·This is both puzzling and interesting for many scientists.
·There are many mysteries yet to be discovered by those interested in science.☆教材解读☆
1.Fantastic facts about the butterfly have been drawing Dr. Taylor’s attention.
◆have been doing sth.是现在完成进行时,意为“一直在做某事”,表示从过去某时开始的某个动作或状态一直延续到现在,而且还在进行。常常表示动作的延续性、重复性以及感彩等。
◆draw one’s attention意为“吸引某人的注意力”。2.Here,as many as 230 million butterflies spend the winter.
◆as…as…意为“与……一样……”,两个as之间可加形容词或副词的原级;也可加“many+复数名词”,“much+不可数名词”或“形容词+a/an+单数名词”,还可以在as…as…前加twice,half等词表示前后者倍数或分数关系。as…as的否定形式为not as/so…as…。
◆spend为及物动词,意为“度过,花(钱/时间)”,常用于固定结构:spend time/money(in)doing sth.花费时间/金钱做某事;spend time/money on sth.在某物上花费时间/金钱;spend time with sb.和某人一起度过时光,句子的主语应为人,spend的过去式和过去分词都是spent。3.The butterflies that return to the south are the great-great grandchildren of the butterflies that left for the north.
◆that return to the south和that left for the north都是定语从句。
◆leave for意为“动身去……”。leave意为“离开”,是位移动词,可使用现在进行时表将来;leave与表示一段时间的状语连用时,应改为be away(from)。4.When they begin to travel north in spring,the females lay eggs.
◆本句中的travel为动词,原意是“旅游,旅行”,此处意为“迁徙”。
◆本句中的north为副词,意为“向北方”,也可说:travel to the north,此时north为名词。
◆lay eggs意为“产卵”。
【注意】 lay的过去式和过去分词为laid,现在分词为laying。5.But in Mexico,people cut down the trees that the butterflies need to rest on because they want more land for farming.
◆本句中的cut down意为“砍伐”。
◆rest在本句中意为“暂停;停止”。
6.Scientists still don’t understand how the butterflies know when to fly south.
when to fly south意为“什么时间飞往南方”,是“特殊疑问词+动词不定式”结构。“疑问词+动词不定式”结构实质上是一个名词性结构,它可以改为一个宾语从句。此时从句与主句的主语是一致的。7.This is both puzzling and interesting for many scientists.
both…and…意为“……和……”,用于连接两个并列成分。both…and…连接两个并列成分作主语时,谓语动词使用复数形式。both…and…的同义词组为not only…but(also)…,意为“不仅……而且……”,反义词组为neither…nor…,意为“既不……也不……”。
8.There are many mysteries yet to be discovered by those interested in science.
interested in science表示“对科学感兴趣的”,作定语,修饰those。be interested in表示“对……感兴趣”。Work in groups of three to play a game.
Task tips:Each group should prepare some pieces of paper and divide them into three columns.Student A writes a person’s name in the first column,folds the paper and passes it to Student B.Student B writes a statement beginning with “who”,folds the paper and passes it to Student C.Student C must finish the sentence and read it out loud.
Example:
Mr. Brownwho is a biologistwill give us a talkJoin the sentences to make attributive clauses.
Example:
We did some experiments yesterday.The experiments were fantastic.
The experiments that we did yesterday were fantastic.
Practice1.I asked him to mail the letter.I wrote the letter to my cousin.
2.Yesterday I met a boy.The boy is a new member in our art club.
3.Mary was carrying a bag.The bag cost her a lot of money.
4.Football is a team sport.Football is popular all over the world.
I asked him to mail the letter
which/that/不填 I wrote to my cousin.Yesterday I met a boy who/that is a
new member in our art club. Mary was carrying a bag
which/that cost her a lot of money. Football is a team sport
which/that is popular all over the world.☆教材解读☆
The experiments that we did yesterday were fantastic.
that引导定语从句,关系代词that代替先行词experiments在定语从句中作did的宾语,可省略。此时,也可使用关系代词which。
【拓展】 在下列情况下,关系代词只能使用that而不能使用which:
不定代词作先行词时;先行词前有序数词或形容词的最高级时;先行词中既有人也有物时;先行词前有the only,just,next等词修饰时;当主句是who/which开头的特殊疑问句时。Ⅱ.用方框中所给词或短语的适当形式填空
cut down,fantastic,draw…attention,butterfly,complete
1.Look!There are many among the flowers.
2.If you the tree,you would do harm to the environment here.
3.The flowers are .
4.I forgot about it.
5.The stranger policemen’s .
butterfliescut downfantasticcompletelydrew attentionⅢ.单项填空
1.Studying in groups is necessary you want to do well in school.
A.if B.until C.unless D.though
2.Li Ming’s shoes are as as Zhang Lei’s.
A.cheap B.cheaper C.the cheaper D.the cheapest
3.Have you read the book is about Li Kaifu?
A.what B.it C./ D.which
4.My English a lot.I can talk with my English teacher in English.
A.improve B.is improved C.has improved D.improving
5.This butterfly eggs on the milkweed.
A.lies B.lays C.lain D.lying
6.I think the three experiments we did yesterday were fantastic.
A.what B.that C.who D.whoseAADCBBHomework
1.Finish off the exercises in the activity book.
2.Preview Lesson 29.
