Unit 4 Welcome to the unit:21张PPT
Unit 4 Task:17张PPT
Unit 4 Reading(II):15张PPT
Unit 4 Integrated skills:19张PPT
Unit 4 Grammar(II):17张PPT
9A Unit 4 Grammar (I):13张PPT
Unit 4 Growing up
at an earlier time than
at a later time than
A Using before, after, when and while
一.before and after
How to use before
Before means earlier than a certain time
Mary had finished her homework before her mother returned.
b. 表示“过了多久后才… ，动作进行到什么程度才……”
The man almost knocked me down before he saw me .
They walked about 30 miles to the west before they saw a village .
They worked day and night about three days before everything returned to normal .
I had hardly sat down before the bell rang.
d. 表示“不知不觉就…..； 还没弄清就……”
Time passed quickly and three months went by before Tom knew it.
9A unit 4 全单元课件
9A Unit 4 Grammar (I).ppt
Unit 4 Grammar(II).ppt
Unit 4 Integrated skills.ppt
Unit 4 Reading(II).ppt
Unit 4 Task.ppt
Unit 4 Welcome to the unit.ppt