初中英语人教版八年级下册PPT课件.ppt

heavy - heavier happy - happier
delicious – more delicious interesting – more interesting important— more important carefully---more carefully quickly---more quickly slowly---more slowly easily--- more easily
Grammar Focus
(二)形容词的比较级和最高级 comparatives and superlatives with adj. and adv.
short - shorter small - smaller
nice - nicer safe - safer
big - bigger thin - thinner
e.g. Two rivers：_t_h_e__Y_a_n_g_t_ze__R_i_v_e_r_ and _t_h_e_A_m__a_z_o_n__R_i_v_e_r_
_T_h_e__Y_a_n_g_t_z_e _R_i_v_e_r_i_s_a_l_m_o_s_t_a_s_l_o_n_g__a_s _t_h_e____ _A_m__a_z_o_n_R__iv_e_r. _T_h_e_A__m_a_z_o_n__is__lo_n_g_e_r__th_a_n__t_h_e_Y_a_n_g_t_z_e_, _b_u_t___ _th_e__Y_a_n_g_t_ze__is__th_e__lo_n__g_es_t_r_i_v_e_r_i_n_C__h_in_a_._
four 4
five
5
six
6
seven 7
eight 8
nine 9
ten
10
eleven 11 twelve 12 thirteen 13 fourteen 14
fifteen
15
sixteen 16
seventeen 17
eighteen 18
nineteen 19
2、20—90等十
twenty 20
1.The project lasted 5 years and cost 2 billion dollars.
2. The Chinese have been making paper for two thousand years.
3. One thousand pounds is a lot of money.
Two cities：__________ and __________ 1.______________________________________ 2.______________________________________ _____________________________________
位数 twenty-one 21
thirty 30
twenty-two 22
forty 40
………………
fifty 50 其它的十位数照此类推，如：
sixty 60 seventy 70 eighty 80 ninety 90
thirty-one 31 forty-two 42 seventy-five 75 ninety-six 96
457 four hundred and fifty-seven 890 eight hundred and ninety 608 six hundred and eight
2)三位数以上的数，从个位往前数，每三位数 加一个逗号，从后往前数的第一个逗号代表 thousand, 第二个逗号代表million, 第三个逗 号是billion，注意这几个词不能用复数形式， 后也不能加and。例如：
8,000,000 eight million
练一练
345 three hundred and forty-five 1001 one thousand (and) one
18,657,421 eighteen million, six hundred and fifty-seven thousand, four hundred and twenty-one
2. Qomolangma is 8,844.43 meters__h_ig_h___.
It’s one of the most pop_u__la_r______ places for
serious mountain climbers. big 3. No ocean in the world is as ________ as
Two animals：__________ and __________ 1.______________________________________ 2.______________________________________ _____________________________________
2. 构成的规则变化: 1) 单音节词和少数双音节词一般在词尾
后加-er 构成比较级 或-est构成最高级. 如： 原级 比较级 最高级 cold –—— colder –—— coldest bright——— brighter———brightest young—— younger—— youngest
2,648
two thousand, six hundred and forty-eight
16,2Hale Waihona Puke Baidu0,064
sixteen million, two hundred and fifty thousand, sixty-four
确切数目与不确切数目的表达： hundred, thousand, million, billion等前面有 基数词，表示确切数目时，用单数，后直接 接复数名词；如： three hundred books one hundred people five thousand students seven million starts
4、十万、百万
十万的说法是： 100.000 a (one) hundred thousand
200.000
million 百万
two hundred thousand a (one) million 1,000,000 two million 2,000,000 ········以此类推 ······
4a. Fill in the blanks with the correct forms of the words in the box.
big much popular long old high
1. The Amazon River is one of the __l_o_n_g_e_st__ rivers in the world. It’s a littlelo_n__g_er____ than the Yangtze River.
4c. Write five questions using comparisons. Then ask your partner your questions.
1. _W__h_a_t_is__th__e_h_i_g_h_e_st__b_u_il_d_i_n_g_i_n_o_u_r__c_it_y_?__ 2. _W__h_o__is_t_h_e__o_ld_e_s_t_p_e_o_p_l_e_i_n_o_u_r__c_it_y_?_____ 3. _W__h_a_t_i_s_t_h_e_m__o_s_t_p_o_p_u_l_a_r_s_t_re_e_t__in__o_u_r__ci_ty? 4.__W__h_a_t_i_s_t_h_e_m__o_s_t _d_e_li_c_io_u_s__fo_o_d__in__o_u_r__ci_ty? 5. __W__h_e_r_e_i_s _t_h_e_b_u_s_i_es_t_r_o_a_d__in__o_u_r__ci_t_y_?___
Which is the deepest salt lake in the world?
The Caspian Sea is the deepest of all the salt lakes.
Did you know that China is one of the Yes, I did. It's much older than the US. oldest countries in the world?
Unit 7
What’s the highest mountain in the world?
Grammar Focus
What's the highest mountain in the world?
How high is Qomolangma?
Qomolangma.
It's 8,844.43 meters high. It's higher than any other mountain.
3、百、千、万
百 hundred 100 one hundred 200 two hundred 以此类推····
千 thousand 1 000 one thousand 2 000 two thousand·········
英语里没有“万”这一单位，万也用 thousand表示。如：10 000 ten thousand 一万20 000 twenty thousand 两万·····
表示确定数量时 用基数词+ hundred， thousand，million，billion
多位基数词读法
1）101~999的三位数由“百位数＋and+两位数 组成”。 如：325—three hundred and twenty-five
102 one hundred and two
635 six hundred and thirty-five 389 three hundred and eighty-nine
the Pacific Ocean. older 4. Although Japanmisu_c_h________ than
Canada, it is _________smaller.
4b. Write two comparisons about two topics. Write true facts.
表示不确切数目时，这类词后加-s且与of连 用。如：
hundreds of people thousands of students millions of birds billions of lions 注意：这类短语中，名词前如有定冠词、指 示代词或形容词性物主代词时，可加of, 但 表示的是范围。如：two hundred of the workers工人中的二百（人）
大多数形容词和副词有三个等级： 原级、比较级、最高级。 一、形容词比较级的构成
1.构成的不规则变化: 2.构成的规则变化:
1. 构成的不规则变化: e.g. good / well – better – best
bad / badly – worse – worst many / much – more – most little – less – least far – farther / further – farthest/ furthest
Grammar Focus
(一)数词 Numeral
数词是用来表示事物的数目和顺序的 词。
数词的分类：
1.基数词 2.序数词 3.分数词 今天我们先来学习一下基数词。
1. 复习1—100以内的所有数字。
2. 掌握百、千、万、十万、百万的 表达法。
1、1-19的基数词
one 1
two
2
three 3
2) 以字母 e 结尾的词只加 –r 或-st 构成 比较级和最高级。
原级
比较级
最高级
nice ——— nicer –——— nicest
fine——— finer———— finest
large —— larger ———— largest
3) 重读闭音节词末尾只有一个辅音字母 时, 先双写这个辅音字母, 再加-er或-est。 如: big – bigger – biggest