1. Unit 1Dream homes
---Grammar

2. 基数词 数词
序数词

3. 基数词
0 zero 1 one 2 two 3 three 4 four 5 five six 7 seven eight 9 nine ten eleven twelve
13 thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty
21 twenty-one twenty-two …
thirty forty fifty sixty
70 seventy 80 eighty ninety

4. one/a hundred , one thousand , ten thousand , one hundred thousand 1,000,000 one million
twenty-six two hundred and sixty ,261 two thousand, two hundred and sixty-one , two thousand and twenty-six ,200,226 one million, two hundred thousand, two hundred and twenty-six

5. one thousand, eight hundred and fifteen
180 =
1,815 =
91,000 =
260,000 =
How do we say it?
one hundred and eighty
one thousand, eight hundred and fifteen
ninety thousand
two hundred and sixty thousand,

6. How do we say it?
8,000,000 =
13, 000,000 =
eight million
thirteen million

7. 序数词
1 = one st = first = two nd = second = three rd = third = four th = fourth = five th = fifth = six th = sixth = seven th = seventh = eight th = eighth = nine th = ninth = ten th = tenth

8. How do you write it? Ordinal numbers 1st = first 10th = 2nd = second
11th =eleventh
3rd = third
12th =twelfth
4th = fourth
13th=
5th = fifth
20th =twentieth
6th =
21st=twenty-first
7th =
22nd=
8th =
23rd=
9th = ninth
30th=
10th=
100th=
tenth
thirteenth
sixth
seventh
twenty-second
eighth
twenty-third
thirtieth
tenth
a hundredth

9. 口诀如下： 　　基变序，有规律，词尾加上th。 　　123，特殊记，词尾字母t,d,d。 　　8加h , 9去e， f来把ve替 (twelve-twelfth /five-fifth) 。 　　整十“y”变ie，以上你都要牢记。

10. Language points:
1. 序数词的运用：
⑴表示日期：e.g. 6月1日 on the first of June/ on June (the) first
⑵表示编号：e.g. lesson 5 the fifth lesson
⑶起副词作用，前无“the” e.g. Simon came first in the English exam.
⑷序数词前有限定词修饰时，不加“the”. e.g. This is my first lesson.

11. Do B2 on Page12

12. 1、Elsa lives on the _________ floor.
2、Ivan lives on the _________ floor.
3、Mary lives on the _________ floor.
4、Peter lives on the _________ floor.
5、Ricky lives on the _________ floor.
6、Wilson lives on the _________ floor.
seventh
fifteenth
fourth
second
ninth
twelfth

13. THANK
YOU !
Unit 21 What are you doing?
Thank you