1、九年级下册英语单元知识点详解Unit4Life on Mars1Comic strip&Welcome to the unit（1）Me neither(P50)Me neither意为“我也不”，源于“neither+be动词/助动词/情态动词+与前句不同的主语”，用于说明后一句所述的情况与前一句所述的否定情况相同，neither用作副词，表示“也不”。例句：-He hasnt been to Hong Kong-Me neither(2)How do you likelife on Mars? How do you like? =What do you think of? 意思是“你觉得怎
2、么样”。例句：-How do you like the Great Wall?-Its greatI like it very much(3)And we mightneed sleeping bags too(P51)might这里意为“可能”，表示推测，另外，might还可以表示请求，意为“可以”。例句：He said he might be late, but he was earlyMight I use your bike?2Reading(1)At present, our spacecraft are too slow to carrylarge numbers ofpassen
3、gers to Mars-it would take months(P52)a number of相当于numbers of意为“许多、大量”用来修饰可数名词复数，作主语时，谓语动词用复数形式；the number of意为“的数量”，作主语时，谓语动词用单数形式。例如：A number of students are playing tennisThe number of the students in our school is over 2000(2)The gravity on Mars is only aboutthree-eighteensof that on the Earth(
4、P53)分数的表达分子用基数词，分母用序数词，分子大于1时，分母加s表示复数。例如：1/3 one third 3/8 three eighths“分数+of+名词”作主语时，谓语动词单复数，取决于名词的单复数。名词为单数则谓语动词用单数，名词为复数则谓语动词用复数。例如：Two thirds of the land is covered with water三分之二的陆地都是被水所覆盖的。One fifth of the students come from the countryside五分之一的学生来自农村。(3) People would have to wear boots that
5、 are specially designed toprevent themselves from floatingoff into space(P53)prevent表示“阻止”时，常用于“prevent sbfrom doing sth. ”结构中，意为“阻止某人做某事”，动词prevent也可以换成stop或者keep。例句：We should prevent/stop/keep farmers from cutting the forests(4)Compared withlife on the Earth, life on Mars would be better in some w
6、ays(P53)compare表示“比较”时，常用的结构有两个：comparewith “把同比较”；compareto “把比作”。例句：Dont compare your children with othersWe often compare the little kids to the flowers of the motherland(5) Life on Mars would be interestingas well aschallenging(P53)as well as表示“既又”，连接两个成分作主语时，谓语动词的单复数通常与as well as前主语保持一致。例句：Mr F
7、ang grows flowers as well as vegetablesJack as well as his parents is going to London3Grammar(1)Are scientists inagreementthat living on Mars would be possible for humans in the future? (P57) agreement名词，意为“同意、协议”，in agreement表示“同意、一致”。例句：Mr Zhang nodded in agreementIm glad we are in agreement about
8、 one thing, at least【拓展】agree的用法agree with sb同意某人agree to sth. 同意某事agree on sth. 在某事上达成一致意见agree to do sth. 同意做某事4Integrated skills(1) However, some other studentswere worried aboutabout living there(P60)worry about sb/sth. “为某人/某事而担心”例句：You dont need to worry about the coming exambe worried about s
9、th. “担心某人/某事”例句：The parents are worried about their sick son(2) Im not sure if its worth therisk(P60)risk表示“冒险时”，既可以作名词，也可以作动词，作名词常和动词take连用，take a risk“冒险”；作动词时，后接动名词作宾语。例句：The fireman took the risk of losing his life and saved the boy from the burning building=The fireman risked losing his life an
10、d saved the boy from the burning building5Study skills&Task(1)There are two moons to visit, but most people maypreferto watch the amazing low-gravity basketball gamesinstead(P63)prefer的用法prefersth. to sth. 同某物比起来更喜欢某物prefer doing sth. to doing sth. 同做某事比起来更喜欢做某事prefer to do sth. 宁愿做某事prefer to do st
11、h. rather than do sth. 宁愿做某事而不愿做某事，相当于would rather do sth. than do sth. instead的用法instead作副词，表示“而不是、代替”，常放在句尾，当后面需要接宾语时，用instead of。例句：Jim didnt go to the park with his classmatesHe stayed in the classroom instead=Jim stayed in the classroom instead of going to the park with his classmates【重点短语】1sle
12、eping bags 睡袋2(all) over again 再、重新3at a/the speed of 以速度4in the form of 以形式5compare with 与相比6prevent sbfrom doing sth. 阻止某人做某事7in some ways 在某些方面8as well as 而且9carry out 开展、执行10after all 毕竟【语法讲解】简单句和复合句之间的转换一、含有状语从句的复合句与简单句之间的转换在英语中，我们可以用at the age of, because of, without等介词短语，将含有状语从句的复合句改为简单句。例如：H
13、e learnt to swimwhen he waseight years oldHe learnt to swimat the age of eight注意：转换时要注意时态和意思的一致性和准确性。二、含有宾语从句的复合句与简单句之间的转换在英语中，我们可以用of, like等介词短语，将含有宾语从句的复合句改为简单句。例句：The photos remind methat I travelled to the UK five years agoThe photos remind meof my trip to the UK five years ago常用的一些动词和介词的搭配有：rem
14、ind somebody ofbe sure/certain about三、含有定语从句的复合句与简单句之间的转换在英语中，我们可以用with, in等介词短语，将含有定语从句的复合句改为简单句。例如：Do you know the girlwho is holding two books in her hand?Do you know the girlwith two books in her hand?The manwho wears a blue shirt is our English teacherThe manin a blue shirt is our English teacher