2019年外研版八下英语册课件：M3 Unit 2 We have not found life on any other planets yet(共13张PPT)

environmentn.环境
3.They are very far away and their light has to travel for many years
to reach us. light n.光;光线;光亮
have to 必须,不得不
4.It is impossible to imagine. impossible adj.(事情)办不到的,不可能的
2.enough作副词,修饰形容词、副词或动词时放在被修饰词后面。如: He is old enough to join the army. 他年龄足够大,可以参军。
3.enough作形容词,修饰名词可放在被修饰词之前或之后,但前面更常见。如: We have enough time to finish the work.=We have time enough to finish the work. 我们有充足的时间完成这项工作。
hundreds of数以百计的, thousands of 数以千计的, millions of 数 以百万计的, billions of 数以十亿计的。它们都表示不确切的数量概念。
当hundred, thousand, million, billion前有具体数字时,要用它们的 单数形式,而且其后不加of,此时表达确切的数量概念。
none为代词,意为“没有一人;没有一个;一点儿也没有”,指“三者或三 者以上都不”,与all是反义词。作主语时,谓语动词可用单数,也可用复数。
辨析:none与no one
①既可指人,也可指物。 ②可单独使用;也可以与of连用,后跟不可数名词或 可数名词复数。 none ③none of短语作主语时,如果代替可数名词,谓语动 词可单数可复数;
句型“adj./adv.+enough+to do sth.”意为“足够……能做某事”。 如: I think Danny runs fast enough to win first prize. 我认为丹尼跑得足够快,能赢得一等奖。
1.句型“...not+adj.+enough+to do sth.”常和句型“too...to...”和“so... that+否定形式的从句”互换。如: He is not old enough to join the army. 他年龄尚小,不能参军。 =He is too young to join the army. =He is so young that he can’t join the army.
助记: enough 词性有三个:用作名词好掌握 形容作定修饰名,名词前后由你定 副词作状表程度,形容、副词后边放 若是用在形、副前,enough位置准错用
1.All the students in the classroom do their homework
.
A.enough careful
B.careful enough
Unit 2 We have not found life on any other planets yet.
Ⅰ.读句子记单词/短语 1.Scientists think that there has been life on the earth for hundreds
of millions of years. hundreds of millions of 数亿;数以亿计
如果代替不可数名词,谓语动词只能用单数形式。 ④常用于回答how many或how much的问句。 ①只用于指人,一般单独使用,不可以与of连用。 no
如:—How many birds can you see there? ——你在那里能看到多少只鸟? —None. ——一只也没有。 —Who is in the library?——谁在图书馆? —No one.——没有人。
5.However,no spaceship has travelled far enough to reach other stars in
ouradGja.l/aaxdyv..+enough+to do sth. 足够……能做某事
Ⅱ.根据课本内容,补全下列句子
6.There has been life on the earth for hundreds of
—I hear that they are wonderful,but I’ve read
noneof them.
3.Everyone is here. No one is away.
hundreds of millions of表达概数的用法
Scientists think that there has been life on the earth for hundreds of millions of years.(P20) 科学家认为地球上的生命已经有上亿年的历史了。
2.None of them has an environment like that of the earth,so scientists
do not think they will find life on them.
none pron.没有一人;没有一个;一点儿也没有 that pron.那,那个(指代已被提及的事物)
1.
visitors came to take photos of Hongyadong during the
vacation.(2018重庆)
A.Thousand B.Thousand of
C.Thousands D.Thousands of
2.Two
students in our school are from the countryside.
system.
many
years.
to reach us.
10.Scientists have sent spaceships to the planet Mars in order to
take
photos
.
none的用法
None of them has an environment like that of the earth,so scientists do not think they will find life on them.(P20) 这七颗行星都没有像地球一样的环境,所以科学家们认为不会在这七颗行星上找到生 命。
A.hundred of B.hundreds of
C.hundred
D.hundreds
...enough to do sth.句型
However,no spaceship has travelled far enough to reach other stars in our Galaxy. (P20)然而, 还没有一艘宇宙飞船飞得足够远,能到达银河系中的其他 恒星。
millions.
of years according to the scientists.
7.According to the passage, eight planets go around the sun.
8.We call the sun and its planets
the
solar
9.The light of the other galaxies has to travel for
1.—How much juice is there in the fridge?
—
.Let’s go to the supermarket and buy some after supper.
A.None B.Nothing
C.Nobody
D.All
选择none/no one填空
2.—What do you think of the four classics (名著)of China?
C.carefully enough
2.Lucy isn’t old enough to carry the box.(找出与划线句子意思相同的
选项)
A.is so young that she can
B.isn’t young enough to
C.is too young to
D.is so young to