八年级下册Unit1—2重要知识点
Unit 1
1.in与after的区别：
(1) in +一段时间：从现在为起点，至将来的一段时间，用于一般将来时。
e.g. Everything will be OK three days.
(2) after +一段时间:从过去的时间为起点，用于一般将来时。
e.g. My uncle bought a new computer after a year.
2.fall的短语：
(1)fall behind:落在······的后面
e.g. Work harder,or you will fall behind others.
(2)fall off:从······上掉下来
e.g. Mary fell off the ladder last night.
3.alone与lonely的区别：
(1)alone
“单独的”。作表语，不作定语，说明独自一人，陈述客观事实。
e.g. He watches TV when he is alone.
(2)lonely
“孤独的”。主观上感到孤单寂寞，作定语时，意思是“荒凉的，荒僻的”，比如lonely country荒凉的乡村。
e.g. The old man lives alone,but he doesn’t feel lonely.
4.(1)see sb. do sth.:看见某人完成某事的整个过程
e.g. I often see him wear casual clothes.
(2)see sb. doing sth.:看见某人正在做某事
e.g. I saw her playing the piano in that room just now.
5.use的短语：
(1)be used by:被······使用
e.g. Rockets are used by astronauts.
(2)use sth. to do sth.:使用某物做某事
e.g. He often uses the computer to study.

Unit 2
1.What’s wrong? = What’s the matter? = What’s the trouble? = What’s up? = What happens to sb.?
2.call sb. up = ring sb. up = give sb. a ring/call = phone sb.= telephone sb.
3.跟某人争吵：argue with sb.
因为某事和某人争吵：argue with sb. about sth.
4.be surprised at sth.：对某事感到吃惊
e.g. We are surprised at the surprising news.
5.either、too与also的区别：
(1)either:位于句末，用于否定句。
e.g. He doesn’t like green, and I don’t,either.
(2)too:位于句末，用于肯定句和疑问句。
e.g. She likes playing the piano, too.
(3)also:位于句中（助动词后，实义动词前），用于肯定句。
e.g. She also likes playing the piano.
6.so与such的用法：
(1)such是一个形容词，修饰名词 such a beautiful girl
(2)so是一个副词，修饰形容词和副词。
★so修饰名词时有两种情况：
①修饰单数可数名词：so beautiful a girl
②前面有many, much, few, little时，要用so。
e.g. The students have so many exercises that they can’t finish them in time.
(3)不可数名词不用so修饰（当没有出现many, much, few, little时）
e.g. This is such useful information that all of us believe it’s important.
7.join与take part in的区别：
(1)join的宾语：团体，组织，俱乐部，加入某人
(2)take part in的宾语：竞赛，会议，战争，讨论
8.borrow sth. from sb.:向某人借某物（借入）
lend sth. to sb.:借某物给某人（借出）
9.ask for sth.：要某物
ask sb. for sth.: 向某人要某物
ask sb. (not) to do sth.: 要某人（不要）做某事
10.plan sth. for sb.: 为某人计划某事
plan to do sth.: 计划做某事
make a plan to do sth.: 计划做某事
11.except与besides的区别：
(1)except
除了······之外，表示所说的不包括在内（有时可与but互换）
e.g. I like all sports except football. 我喜欢所有的运动，除了足球。
Everyone is here except Mary. 全班都到了，除了玛丽。
(2)besides
除了······之外，表示除去的事物包括在内
e.g. What other sports do you like besides football? 除了足球外，你还喜欢哪些运动？
Lucy and Lily are here besides Mary. 除了玛丽外，露西和莉莉也在这里。
12.和某人争吵: have a fight with sb.
因某事而争吵：have a fight about sth.
13.complain about/of sth.: 埋怨某事
complain to sb. of/about sth.:向某人关于某事提意见
complain that···
14.compare sth. :比较某物
compare A with B:把A和B作比较
compare A to B:把A比作B









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