数学难题 某工厂的大门,其中四边形ABCD是长方形

2022-01-06 20:25 点击:143 编辑:邮轮网

可以通过, 宽1.6米的卡车能通过大门所允许的最大高度为
AD+ 根号下【(AB/2)^2- (1.6/2)^2】=2.9,
2.3米<2.9米,所以该的货车可以通过

人教版初二英语语法。

1. so+谓语+主语:…也一样. 谓语:be动词/助动词/情态动词

2. so+主语+谓语:的确如此,真的这样.

3. help yourself/yurselves to...请随便吃点...

4. 发现sb做sth : find sb doing sth

5. 不完全同意I don’t really agree.

完全不同意I really don’t agree.

6. 或者..或者...either…or…..就近原则

既不..也不..neither…nor….就近原则

既....又...both…and….谓语用复数

7. 看起来,似乎It seems/seemed that…..

8. 由于...而闻名be famous for….

9. 餐馆就餐用语:a table for two/sit at the table by the window/here’s the menu/May I take your order?/could we have the bill?/That’s all.

10. 问路Which is the way to…/where is…/How can I get to…/Is there a..near here/Can you tell me the way to…/Can you tell me how I can get to…?

11. turn right at the third crossing/traffic lights在第3个路口往右拐=take the third crossing on your right

12. 过桥go across the bridge=cross the bridge

13. 走到路的尽头go up this road to the end=go on until you reach the end.

14. at the street corner在街角

15. on sb’s way to….在sb去…的途中/路上

16. what’s the matter?=what’s wrong?=what’s the trouble?怎么了?

17. be sick in hospital/in bed 生病住院/卧床

18. Maybe it is there=it may be there可能在那里.

19. It takes/took/will take sb+时间+to do sth. Sb做sth花费了…时间

20. 路途遥远It’s (5 kms)far(away) from…=That’s quite a long way.

21. wait for…等待

22. 五分钟的步行/驾驶路程:five minutes’ walk/drive

23. 迷路lose sb’s way/sb be lost/sb get lost

24. just then=just at that time/moment就在那时

25. 首先first of all=at first

26. a big city like Tokyo像东京这样的大城市

27. It’s easy/interesting/important/ (for sb) to do sth.(对sb来说)做sth是容易的/有趣的/重要的.

28. if 条件状语从句:从句一般现在时,主句一般将来时。如:If it rains tomorrow, I will not go to the zoo.

29. at the head /end of…在…的前/尾部

30. 我的背很疼. My back hurts badly.

31. 为…做准备get /be ready for…

32. stop sb (from) doing sth.阻止/不让sb做sth

33. have a good/wonderful time=enjoy oneself 玩得很高兴

34. answer in a tired voice/with a smile 用疲惫的声音/面带微笑回答。

35. quarrel with sb on sth 为了sth与sb 吵架

36. complain about sth 为…而抱怨,投诉

37. 生病用语:sb have a headache=sb have a pain in the head 头痛,have a cough 咳嗽,have/catch a cold 感冒,have cancer 得了癌症。

38. have /take the medicine three times a day 吃药,每天3次

39. take sb’s temperature 量体温,look over 医生检查病人

40. drink more water 多喝水,take more exercise 多锻炼

41. sb醒来: sb wake up, //sb 醒着的:sb be awake

42. sb 睡着了入睡 be/fall asleep

43. 忙着…bu busy doing/with sth

44. as soon as… 一… 就 ...

45. sleeping pills安眠药,light music 轻音乐

46. again and again 再三地,一次又一次

47. dream about…梦见…; dream of… 梦想成为…

48. 系动词+形容词: be/smell/taste/sound/look/feel/turn/get/become

49. make trouble制造麻烦,惹是生非,make a noise 制造噪音

50. every five minutes 每隔5分钟

51. instead/instead of…代替,取而代之,反而

52. write to sb. 写信给sb

53. get enough sleep 睡眠充足;stay happy 保持心情开朗

54. on time 准时;in time 按时

55. sb had better (not) do sth, sb 最好(别)做sth

56. land on …登陆

57. pull…out of..=pull…up from…拉上来

58. 不定代词:something/anyone/nobody/everywhere等

59. we’re all by ourselves=we’re alone.单独,独自

60. feel a little afraid/don’t be afraid. 有点害怕/别害怕

61. perhaps=maybe也许,可能

62. not …until… 直到…才…

63. sooner or later 迟早,早晚

64. ran after追//ran to …向..跑去// ran away 逃跑了

65. eat up 吃光// use up 用完

66. take (good) care of ..=look after…照顾,保管

67. 我自学英语learn English by myself= teach myself English

68. learn to do sth 学会…

69. 记日记 keep a diary,写日记 write a diary

70. leave sb by oneself 单独留下sb

71. join in the League/Party 入团/党

72. 越来越…:比较级+and+比较级; more and more +多音节词。如:bigger and bigger , more and more interesting

73. 越…, 就越…: the +比较级,the +比较级。 如:越大越好:the bigger, the better

74. turn on/off 开/关(电器),turn up/down音量开大/小

75. the whole story=all the story整个故事,整件事情

76. 过了一会儿after a while/moment

77. make faces 做鬼脸

78. 名胜,景点interesting places=places of interest

79. my hometown in Zhejiang 我浙江的老家

80. 暑假summer holidays; 五一假期 May 1st holiday

81. a strong wind大风;in the wind 在风里

82. make sb do sth. 使/逼迫sb做sth

83. 倒装句(为了强调)There he is./ Away he went.

84. with these words. 说完这些话,说着说着(伴随状语)。

85. I don’t know how to use it yet. 我不知道怎样使用它。

where to go. 我不知道该去哪里。

what to do. 我不知道该做什么。

86. wait for sb’s turn to do sth 等着轮到sb做sth

It’s sb’s turn to do sth. 轮到sb去做sth
被动:be+动词过去分词
eg:The trees are planted every year.
过去完成时:
过去完成时表示在过去某一时刻或某一动作之前已经发生的动作或情况,一般用在描述过去的某个时点已经发生过的动作或情况的句子中,即:过去的过去。如:
When we got there, the football match had already started.
当我们赶到时,足球比赛已经开始了。
过去完成时由“主语+had+动词过去分词”构成。其肯定句,否定句和疑问句结构如下:
肯定句:主语+had+过去分词+其他.
否定句:主语+had not+过去分词+其他.
疑问句:Had+主语+过去分词+其他?
He had worked for two years by then. 到那时他已经工作两年了。
He hadn't worked for two years by then. 到那时他已经两年不工作了。
Had he worked for two years by then? 到那时他已经工作两年了吗?
三、过去完成时的基本用法
1. 过去完成时表示在过去某一时间之前已完成的动作,表示对这一过去时间造成的结果或影响。常用以下几种方式:
(1) 用by,before等构成的介词短语。 eg:
Linda had learnt 10 English songs by the end of last month.
到上个月底,琳达已经学了10首英文歌曲。
John had repaired that machine before midnight.
在半夜之前约翰已经修好了那台机器。
(2) 用when, before, after等引导的时间状语从句。如:
The train had started before we got to the station.
在我们到达车站之前,火车已经开了。
The plane had taken off when I reached the airport.
我到达机场时,飞机已经起飞了。
2. 过去完成时还可以表示过去某一时间以前发生开始的动作持续到
这一过去的时间。常与for, since引导的表示一段时间的短语或从句连用。如:
I had worked in a hospital for three years before I came here.
我来这之前,在一家医院已经工作三年了。
He told us that he had worked here since 10 years before.
他告诉我他自从十年前就一直在这儿工作了。

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