三、第四单元知识点梳理
1、一般过去时情态动词的句型转换：
(1)could引导的一般过去时的否定句，在could之后加not：could not=couldn’t
Six years ago, I could write.(否定句)
Six years ago, I couldn’t write.
(2)could引导的一般过去时的一般问句，将could调至句首：
Mike could read and draw.(一般问句)
Could Mike read or draw?
(3)could引导的特殊问句：特殊疑问句+could引导的一般问句：
They could ride a bike.(对画线部分提问)
Could they ride a bike(用do what替换) ？
What could they do ？
2、一般过去时和一般现在时的动词形式对比：时间决定时态
根据句中时间副词的不同，使用不同的动词形式。重在引导学生区分动词原形、三单和动词过去时。可以采用表格的方式进行呈现，同时配合一般现在时的练习加以巩固。Unit4中出现的动词总结如下：
动词原形 三单形式 过去时 动词原形
三单形式 过去时
read reads read draw draws drew
write writes wrote do does did
use uses used call calls called
have has had listen listens listened
watch watches watched make makes made
buy buys bought eat eats ate
fly flies flew get gets got
go goes went take takes took
work works worked invent invents invented
look looks looked talk talks talked
wait waits waited ride rides rode
3、字母组合er的发音：/ə/。
4、有关今昔对比作文的写法：Unit4 Then and now其实参照的是高中英语中的作文基础写作，采用过去和现在对比的方式，教会学生如何写作。围绕的话题是“Changes in our life”，也可以说是“Compare the past with the present”,让学生学会写作格式的同时，理解一般过去时和一般现在时的不同之处。句型：1、…years ago …now… 2、句型：This was me years ago, I was I could I couldn’t Now, I .
5、有关某国人复数的表示：口诀：中日不变，英法变，其余+s
"某国人"的复数有三种类型：
1） Chinese, Japanese国人单数复数同形，不需加s。（还有 Swiss（瑞士人）
2） Englishman, Frenchman复数要把man 变为men。（Dutchman（荷兰人）也是）
3） 其他各国人以–an, -ian收尾的均直接加s。如：Americans, Australians,，Germans等。
6、有关动词过去式的变化：
不规则动词有：（Unit4新增4个）
Unit4 写 write wrote
阅读 read read
制造 make made
买 buy bought
规则动词有：（新增3个）
Unit4 听 listen listened
发明 invent invented
使用 use used
7、同义句：
(1) He also writes emails.= He writes emails too.
(2) What day is today?=What day is it today?
8、介词的用法：
in the office at home，
listen to the radio read newspapers for news
on the Internet buy things from shops
make friends at school from all over the world
on holiday look out of the window
go on make a sentence with ‘egg’
wait for the answer stick a photo of yourself
compare the past with the present
9、不定冠词an构成的短语:
an email, an e-books, an e-friend, an English lesson, an egg.
可以补充：an American, an answer, an angry teacher, an aeroplane,
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