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一般过去时、数学百分数

发布时间:2013-12-15 09:34:14  

一般过去时

一般过去时表示过去某个时间发生的动作或存在的状态。常和表示过去的时间状语连用。如:last year, yesterday等; 也可表示过去经常反复发生的动作,常和often, always等频率副词连用。

例如:

①I saw him in the street yesterday. 昨天我在街上看见他了。

②Li Mei always went to school on foot last year. 去年李梅总是步行上学。 II. 一般过去时的构成 动词过去式的构成:

(1)规则动词过去式的构成有四条规则:

①一般在动词原形末尾直接加上-ed。如:look-looked。 ②以不发音的字母e结尾的动词,去e再加-ed。如:live-lived。

③末尾只有一个辅音字母的重读闭音节,先双写这个辅音字母,再加-ed。如:stop-stopped。 ④末尾是辅音字母+y结尾的动词,先变y为i,然后再加-ed。如:study-studied。 (2)不规则动词的过去式需特殊记忆。如:am(is)-was, are-were, go-went, come-came, take-took, have (has)-had等。

III. 一般过去时的几种句型

肯定句结构为:主语+动词的过去式+其它。如:He went to the toy store yesterday. 他昨天去玩具店了。

否定句结构为:主语+did not (didn't)+动词原形+其它。如:He didn't go to the toy store yesterday. 他昨天没去玩具店。

一般过去时的一般疑问句的构成:

Did+主语+动词原形+其它?如:

1) -Did you go to Beijing last week? -Yes, we did. (No, we didn't.) 2) -Did you meet the businessman before? -No, I didn't. (Yes, I did.) 一般过去时的特殊疑问句的构成: 疑问词+did+主语+动词原形+其它?如:

1) -What did you do last night? -I did my homework.

2) -Where did you go last week? -I went to Shanghai with my parents. 一般过去时口诀

一般过去时并不难,表示过去动作、状态记心间。 动词要用过去式,时间状语句末站。

否定句很简单,didn't 站在动词原形前,其它部分不要变。

一般疑问句也好变,did放在句子前,主语、动词原形、其它部分依次站。 特殊疑问句也简单,疑问词加一般疑问句记心间。 最后一条请注意,动词过去式要牢记。 小学阶段要掌握的几个动词的过去式:

watched TV, washed clothes, played football, cleaned the room, visited grandparents, went to a park, went swimming, read a book, went fishing, went hiking, learned Chinese, sang and danced, took pictures, climbed a mountain, ate good food, bought presents, rowed a boat, saw elephants, went skiing, went ice-skating.

一般过去时的练习

一、用所给的动词的适当形式填空。

⒈He ___________(visit) the Great Wall last year.

2.We____________(have) a good time yesterday.

3.We often __________(go) to school by bus last year.

4.I __________(live)in the village when I was a child.

5.Mike__________(see) a big tiger in the nature park last year.

6.Sam___________ (do) the housework yesterday.

7.________(do) you _________(enjoy) yourself yesterday?

8.________(do)you __________(play) the violin in the artroom yesterday? No, I didn't. I___________(draw)some pictures there.

9.. I __________ (eat) a big pizza yesterday.

10.There_________ (be) many sheep on the farm last year.

11. I _________ (watch) a cartoon on Saturday.

12. Her father __________ (read) a newspaper last night.

13. We _________ to zoo yesterday, we ___________ to the park. (go)

14. _________ you __________ (visit) your relatives last Spring Festival?

15. _________ he __________ (fly) a kite on Sunday? Yes, he __________.

二、选择填空

( ) 1. She watered the flowers ________.

A . tomorrow B. sometimes C .yesterday morning

( ) 2.What ____ Mike do last weekend ?

A . do B. does C . did

( ) 3. I ___ my room last Sunday.

A .cleaned B . clean C. am cleaning

( ) 4. I often help my mother _____ housework.

A . does B. did C . do

( ) 5. _____ you _____ TV last night .

A .Do, watch B . Did, watch C. Did, watched

( ) 6.---Did your father write an e-mail yesterday ?

A .Yes, he did. B .Yes, he does C .No, he don’t

( ) 7.They _____ on a trip in February ,2007.

A .are going B .going C .went

( ) 8.We’re going to _____ mountains tomorrow .

A. climb B. climbed C. climbing

( ) 9. ____ he ____ football two days ago?

A .Does , play B .Did , played C .Did , play

( ) 10.----Good afternoon, Miss Lee. How does Mike feel? -----He’s tired . He ____ a lot of work ______ .

A . does , this morning B .do , this morning C .did , this morning

( ) 11. There _____ a cat and two birds in the tree just now..

A. were B. has C. is D. was

( )1 2. Why _____ you buy some fruit?

A. not B. not to C. don’t D. don’t to

( ) 13. Would you like _________ for your breakfast?

A. any eggs B. any strawberries C. some bread D. some apples juice

( ) 14. Do you know the answer ________ the question?

A. to B. of C. at D. in

( )1 5. Thank you ________ me.

A. for help B. for helping C. at helping D. to help

( )16. I’m going to school ______ Monday morning.

A. at B. in C. of D. on

( ) 17. ________ would your brother like as a birthday present?

A. How B. What C. How many D. Where

三、连词成句。

1. did, what, you, yesterday, do.

______________________________________________________________

2.watch, John,did, TV, weekend, last.

______________________________________________________________

3. went, I , to, by, park, a, bike

______________________________________________________________

4. jumped, the, into, lake, he, and, the, to, swam, kite.

______________________________________________________________

四、根据句意,填上合适的单词。

1.-Where________ you go on your holiday? - I _____ _____ a park。

2.- ________ did you do on your holiday? - I ________ presents。

3.- ________did you go there?I I went________ plane.

五、用be动词的适当形式填空

1. I ______ (watch) a cartoon on Saturday.

2. Her father _______ (read) a newspaper last night.

3. We _________ to zoo yesterday, we _____ to the park. (go)

4. ______ you _______ (visit) your relatives last Spring Festival?

5. ______ he _______ (fly) a kite on Sunday? Yes, he ______.

6. Gao Shan _______ (pull) up carrots last National Day holiday.

7. I ____________ (sweep) the floor yesterday, but my mother ______.

8. What ______ she _______ (find) in the garden last morning? She __________ (find) a beautiful butterfly.

认识百分数

一、填空

1、()千克的25%是60千克,2千米是3千米的()%。

5是8的( )% ,8是5的( )% 。

5比8少( )% ,8比5多( )%

比5千克多20%是()千克,比()多25%是8千米 。

比()少40%是3吨。15升减少10%后是()升。

2、一件衣服80元,比原来降低20元,这件衣服是打()折出售的。

3、某款书包打八折后售价是120元,如果打九折出售,这款书包需要()元。

4、张阿姨看中一套套装,原价1800元,现商场八折酬宾,张阿姨凭贵宾卡在打折的基础上又享受10%的优惠,买这套套装实际付了()元。

5、某商场二月份比一月份的营业额少62万元,一月份营业额是二月份的150%,二月份营业额是()万元,按营业额的5%缴纳营业税,二月份应交营业税()。

6、在一个减法算式中,减数是差的50%,已知被减数、减数和差的和是8,差是()。

二、列式计算

1、 一个数的62.5%是15,它的50%是多少?

2、一个数的20%比它的1/4少19.6,这个数是多少?

三、解决问题

1、 列式并计算

(1) 一种零件,由原来每件成本80元,降低到48元,降低了百分之几?

(2) 一种零件,现在每件成本80元,比原来降低了48元,降低了百分之几?

(3) 修一段120千米长的高速公路,第一周修了全长的20%,第二周修了全长

的40%,第一周比第二周少修了多少千米?

5 1 1 (4) 水果店运进 8 吨苹果,第一天卖出这些苹果的 5 5 吨,

两天卖出苹果多少吨?

(5) 某公司现在投资20万元,比计划节约投资15万元,节约投资百分之几?

(6)一条路,已经修了20%,还剩400米没有修,这条路原来长多少米?

(7)一条路,已经修了40%,正好修了200米,这条路原来长多少米?

(8)一件上衣打七折后,售价是210元,现价比原价便宜多少元?

2、(1)瑞星2007版杀毒软件打七五折销售后,现价是24元,原价是多少元?

(2)瑞星2007版杀毒软件打七五折销售后,便宜了24元,原价是多少元?

3、(1)前进镇去年水稻总产量是2400吨,比小麦总产量多20%,小麦总产量是多少吨?

(2)前进镇去年小麦总产量是2000吨,水稻总产量比小麦少二成,水稻总产量是多少吨?

4、(1)一批货物,第一次运走40%,第二次运走15吨,两次一共运走这批货物的70%,这批货物原来有多少吨?

(2)一批货物,第一次运走40%,第二次运走45%,第一次比第二次少运了20吨,这批货物原来有多少吨?

1

5、(1)六年级男生比女生多5,女生比男生少45人,女生多少人?

1

(2)六年级男生比女生多5,男生和女生共220人,女生多少人?

6、(1)养鸡场养公鸡和母鸡共4800只,公鸡只数是母鸡只数的60%。公鸡有多少只?

(2)养鸡场养公鸡比母鸡少1200只,公鸡只数是母鸡只数的60%。母鸡有多少只?

7、一辆汽车从甲地开往乙地,已经行了全程的40%,再行20千米,就正好行了全程的一半。甲乙两地相距多少千米?

8、(1)一根绳子,第一次剪去3米,第二次剪去它的20%,还剩5米,这根绳子原来长多少米?

(2) 一根绳子,第一次剪去它的1/5后,又接上3米,现在是原来的60%,这

根绳子原来长多少米?

(3) 一根绳子,第一次剪去它的1/5后,又接上10米,现在比原来长25%,

这根绳子原来长多少米?

9、一件毛衣现在售价51元,比原来降价15%,降价多少元?

10、一件衣服,新百和中央标价都是800元,新百打八折销售,中央满400返还现金100元,在哪家买划算?(计算说明理由)

11、一本书已经读了75%,比没读的多40页,这本书有多少页?

12、南山镇今年计划造林200公顷,结果上半年造林124公顷,下半年造林100公顷,完成计划的百分之几?比计划超额百分之几?

13、某地新建一条公路,全长800米,已建好320米,未建的占全长的百分之几?

14、一台电脑原价8000元,现价6000元,降价了百分之几?

15、认真比较下面各题。

机床厂去年生产机床500台,今年生产600台,今年生产的是去年的百分之几?

机床厂去年生产机床500台,今年生产600台,今年比去年超额百分之几?

机床厂去年生产机床500台,今年生产600台,去年比今年少了百分之几?

机床厂去年生产机床500台,比今年少生产100台,比今年少了百分之几?

机床厂去年生产机床500台,比今年少生产100台,今年比去年多了百分 之几?

16、学校造林绿化,栽下了200棵树,结果有20棵没成活。求成活率。

17、有10袋花生,平均每袋重45千克,一共榨得花生油108千克,求出油率。

18、一件商品进货价是380元,售出价400元,求盈利率。

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