为您找到与something的用法详解 英语知识大全相关的共200个结果:
data有数据;资料等意思,那么你知道data的用法吗?下面跟着读文网小编一起来学习一下data的英语用法_data的知识,希望对大家的学习有所帮助!
1. If they value these data, let them pay for them.
他们要是看重这些数据,就让他们出钱买。
2. We gained a rich supply of data which would normally be inaccessible.
我们得到了通常难以获取的大量数据。
3. Other recommendations relate to the details of how such data is stored.
其他建议涉及此类信息储存方面的一些细节。
4. The data can subsequently be loaded on a computer for processing.
接下来可将数据载入计算机处理。
5. Data mining is used to analyse individuals' buying habits.
数据采掘被用来分析个体的购买习惯。
6. A lot less time is now spent entering the data.
现在输入数据花费的时间少多了。
7. A single CD-ROM can hold more than 500 megabytes of data.
一张只读存储光盘能容纳500兆以上的数据。
8. All the data is then dumped into the main computer.
所有数据随后被转存至主计算机。
9. Birthplace data are only the crudest indicator of actual migration paths.
出生地信息只能非常粗略地显示实际移民过程。
10. You can compress huge amounts of data on to a CD-ROM.
可以把大量的数据压缩到一张CD-ROM上。
11. There are data on the rates of diffusion of molecules.
有关于分子扩散速度的数据。
12. The data that's being used to fault American education is highly politicized.
用来指责美国教育的数据被高度政治化了。
13. The study was based on data from 2,100 women.
这项研究基于从2,100名女性那里收集来的资料。
14. We were drowning in data but starved of information.
我们淹没在大量的数据中却找不到有用的信息。
15. We have reviewed the data that we hold for the area.
我们已经审核过为该地区保存的数据了。
data的英语用法知识相关
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在备考英语四级的过程中,各位考生不仅要注意词汇的积累,句型的掌握,还要注意标点符号的正确使用。下面是读文网小编整理的英语四级作文必备知识训练:标点符号的用法,以供大家学习参考。
分号有时又称为小句号。它表示一个停顿,其停顿时间在逗号与冒号的停顿时间之间。文章如采用许多分号,其风格则变得严肃、正式。为了正确使用分号,有必要先学会辨认主句。当两个主句没有任何连接词(and, but, or, nor, for)连接而出现在同一个句子里,这时最好采用分号使之分离。分号的主要作用很简单,它常用于分离没有连接词连接的句子。但最好不要在从句之间形成如此之强的停顿。如果你要连接从句,而又不愿意用连接词时,则采用分号。
The world is a comedy to those that think; a tragedy to those that feel.
You don’t write because you want to say something; you write because you’ve got something to say.
In the past, boy babies were often dressed in blue; girls, in pink.
Can’t you see it’s no good to go on alone; we’ll starve to death if we keep traveling this way much longer.
John F. Kennedy said at his inaugural speech, "Ask not what your country can do for you; ask what you can do for your country."
Our power to apprehend truth is limited; to seek it, limitless.
Science needs to be lived alongside religion, philosophy, history and esthetic experience; alone it can lead to great harm.
下列各词和短语如用于连接复合句时,常与分号连用:
then however thus furthermore
hence indeed consequently also
that is nevertheless anyhow in addition
in fact on the other hand likewise moreover
still meanwhile instead besides
otherwise in other words henceforth for example
therefore at the same time even now
例:
Being clever and cynical, he succeeded in becoming president of the company; meanwhile his wife left him.
The weather was cold for that time of the year; nevertheless, we set out to hike to the top of that mountain.
According to one national survey, high school boys expected a starting salary of $19,500 for their first full-time job; on the other hand, high school girls expected a starting salary of only $15,000.
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下面小编给大家总结了英语连词的用法,希望对大家的英语学习有帮助。
1. —Oh, I failed again
—Don’t lose heart. One more effort, ________ you will succeed.
A. so that B. therefore C. however D. and
2. ________ a difficult situation, so you should send him a message and give him some advice.
A. As he is in B. He is in C. Being in D. He being in
3. She said she would work it out herself, ________ ask me for help.
A. and not to B. but not C. and prefer not D. rather than
4. ________ enough time, but I couldn’t do it better.
A. I was given B. Given C. To be given D. Though I was given
5. —How can I wake up so early?
—Set the alarm at 5 o’clock, ________ you’ll make it.
A. but B. or C. and D. so
6. For a person with reading habits, a printed page contains not only words ________ ideas, thoughts and feelings.
A. yet B. and C. or D. but
7. Information technology is taught in most schools, ________ we have entered the information society.
A. so B. while C. still D. for
8. English is understood all over the world ________ Turkey is spoken by only a few people outside Turkey itself.
A. while B. when C. if D. as
9. I was on the point of going to bed ________ Mr. Zhang rang.
A. as B. when C. while D. and
10. I asked him whether he had done all the work himself ________ whether he had had any assistance.
A. and B. but C. nor D. or
11. In some countries, ________ are called “public schools” are not owned by the public.
A. which B. as C. what D. that
12. ________ happens in the world makes us happy and sad by turns.
A. That B. What C. Which D. Whether
13. I read about this story in some book or other, does it matter ________ it was?
A. where B. what C. how D. which
14. One of the men present held the view ________ the book said was right.
A. what that B. what C. that D. that what
15. ________ I had walked for six hours, I was tired out.
A. After B. Before C. When D. As
16. Tom make up his mind to get a seat for the football match ________ it means standing in a queue all night.
A. as if B. as though C. even if D. whatever
17. The roof fell ________ he had time to dash into the house to save his baby.
A. as B. after C. until D. before
18. Doing your homework is a sure way to improve your test scores, and this is especially true ________ it comes to classroom tests.
A. as B. since C. when D. after
19. I have been keeping that photo ________ I can see it every day, as it always reminds me of my college days.
A. which B. where C. whether D. when
20. You may borrow this book ________ you promise to give it back.
A. in case B. so long as C. as if D. even if
【答案解析】
1. D. 考查“祈使句/名词+and+陈述句”句型。句意为:“再努力点,你就会成功的”。
2. B. so(因此)是并列连词,引出一个表示结果的分句,前面应是一个表示原因的分句,而无需再用连词,排除A;C和D又不是句子,也错了。
3. D. 因为rather than是对称连词,意为“而不”
4. A. 因为but是并列连词,后面是个句子,前面也一定是个句子,而不是一个分词短语或不定式短语,更不能再用连词though,所以排除B、C和D。
5. C. 考查“祈使句+and+陈述句”句型,意为“如果…就…”。虽然or也可用于此句型,但or是“否则、要不然”之意,如:Work hard, or you’ll fail. (努力学习,否则就会不及格。)
6. D. 因为not only…but (also)…是固定搭配7. D. 因为句中的并列连词for表示原因,是对前面分句所述内容的解释或补充说明。
8. A. 因为句中的并列连词while表示“对比或相反”。
9. B. 因为句中的并列连词when = just at that time, 意为“这时(突然)”。
10. D. 因为只有or才能表示选择,意为“(是…) 还是”。
11. C。本题考查what引导主语从句,并在主语从句中作主语。句意为“在许多国家,所谓的“公立学校”并非公众拥有。
12. B。本题考查引导主语从句的连接词。that引导主语从句只起连接作用,在从句中不作任何成分,无意义,但不能省略。what除引导主语从句外, 还在从句中作成分。which指一定范围内的“哪一个”;whether意为“是否”。根据句意“世上的事喜忧交替”可知答案为B13. D。该题考查宾语从句。可以看作是does it matter which book it was的省略。一定注意此题受母语干扰,很容易错选答案为A。只要抓住题干前一句I read about this story in some book or other的提示,就可知道是指一定范围内的“哪一个”,故答案为D。
14. D。that引导同位语从句;what the book said是同位语从句中的主语。
15. A。本题考查以after引导的时间状语从句,意为“在…之后”。句意为“步行了六小时后,我累坏了”。
16. C。even if=even though,引导的让步状语从句,意为“即使, 尽管”,符合题意。
17. D。本题考查before引导的时间状语从句,意为“在……之前”。句意为“他来不及冲进去救他的孩子,屋顶就塌了”。
18. C。When it comes to. . . 是一固定句型,意为“当谈到……时,涉及”。句意为“做作业是提高考分的一个可靠方法,这在涉及到课堂测验时尤其正确”19. B。该题考查where引导的地点状语从句,表示“在…地方”。句意为“我一直把照片放在我每天都能看到的地方,因为它总使我回想起大学里的日子”。
20. B。so long as=so long as, 意为“只要”,表示条件。句意为“只要你答应归还,你就可以把这书借走”。
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suggest 是个及物动词,后面可以跟名词、代词、动词 -ing 形式或从句作它的宾语。各种试题对 suggest的考查通常涉及到它的非谓语动词形式、宾语从句及宾语从句的虚拟语气等方面。下面就结合历年高考试题,对suggest 的用法作一小结,希望对大家有帮助。
suggest作英语动词的用法大全
一、有“建议”的意思。advise、propose也有此意,请比较它们用法的异同:
1) 都可接名词做宾语
She suggested/ advised/ proposed an early start. 她建议早一点出发。
We suggested/ advised/ proposed a visit to the museum the next day.
我们建议明天去参观博物馆。
2) 都可接动名词做宾语
I suggested/ advised/ proposed putting off the sports-meet. 我建议将运动会延期。
They suggested/ advised/ proposed waiting until the proper time.
他们建议(我们)等到恰当的时机才行动。
3) 都可接that宾语从句,that从句用should+动词原形,should可以省略。
She suggested/ advised/ proposed that the class meeting (should) not be held on Saturday.
她建议班会不要在星期六举行。
We suggested/ advised/ proposed that he (should) go and make an apology to his teacher.
我们建议他去向老师道歉。
4) advise可接动词不定式复合宾语,propose可接不定式做宾语。
I advised him to give up the foolish idea. =I suggested/proposed his/him giving up the foolish idea.我建议他放弃那愚蠢的念头。(suggest和propose在口语里可接动名词的复合宾语)。
We proposed to start early. =We proposed starting early.我们建议早一点出发。(接不定式不用suggest和advise)
二、有“提出”的意思。
如:He suggested a different plan to his boss. 他向老板提出了一个不同的计划。
Xiao Wang suggested a way to solve the problem. 小王提出了一个解决这个问题的办法。
三、有“暗示、表明”的意思,其主语往往是事物,而不是人。
1) 接名词或动名词做宾语。
The simple house suggested a modest income. 这座简朴的房子表明(房主的)收入并不高。
Her pale face suggested bad health. 她脸色苍白,看来身体不好。
The thought of summer suggests swimming. 一想到夏天,就使人们联想到游泳。
2) 接宾语从句,从句用陈述语气。如:
The decision suggested that he might bring his family. 这个决定表明他可以把家属带来。
The expression on his face suggested that he was very angry. 他脸上的表情表明他很生气。
四、在主语从句It is suggested that…及名词suggestion后面表示具体建议的表语从句、同位语从句都应用should+动词原形,should可以省略。如:
It was suggested that we (should) give a performance at the party.
人们建议我们在晚会上表演节目。
His suggestion was that the debts (should) be paid off first. 他的建议是先把债务还清。
The doctors made a suggestion that the new hospital (should) not be set up on the hill.
医生们建议不要把新医院建在山上。
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音标是学习英语的重要工具,是学好英语的坚实基础.熟练掌握音标及其拼读规律不仅可以保证单词能够读准,更重要的是可以使学生增强自信心,激发其学习英语的兴趣.因此,语音教学对学生依然重要.近年来,音标的教学不可忽视.
1.什么是英语音标?
什么是音标?音标就是记录音素的符号,是音素的标写符号。它的制定原则是:一个音素只用一个音标表示,一个音标只表示一个音素。如汉语拼音字母、英语的韦氏音标和国际音标等。 狭义上的”音标“意思就是指英语音标。
2.什么是国际音标?
国际音标International Phonetic Alphabet,原义是“国际语音字母”简称IPA,由国际语音协会制定。
1888年,由英国的H~斯维斯特倡议,由法国的P~帕西和英国的D~琼斯等人完成,发表在《语音教师》上(“国际语音协会”前身“语音教师协会”的会刊),这是历史上第一个国际音标表。后经多次修订,现通行的是1979年修订的方案。
国际音标是英法两国学者创定的,主要适用于表注印欧语言、非洲语言和一些少数民族语言。它发表后,在欧洲语言学界比较流行。美国人多数仍用他们自己研究美洲印地安语的符号。
3.什么是kk音标和dj音标?
我们常见有KK音标 和 DJ 音标,那么DJ 音标指的是什么音标呢?
DJ音标跟英国语音学家Daniel Jones有关。他根据IPA编了一本英国英语的发音辞典English Pronouncing Dictionary(第1版至第12版,最后一版的出版时间为1963)。
(附:KK音标是国际音标的一种,DJ音标也是其中的一种。KK音标跟两位美国语言学者J. S. Kenyan和T. A. Knott有关。他们根据IPA所编的描述美国英语的发音辞典(A Pronouncing Dictionary of American English 1944,1953)里所用的发音符号,就是一般通称的KK音标。)
说明:有人误认为国际音标就是注英国音的音标,而KK是标美国音的。这种说法把国际音标说成好像只能用来标英国音,而且把KK音标认为不是国际音标。其实这是不正确的。国际音标,如其名,是设计来标注国际各种语言的发音的,很多语言学家把国际音标做局部修改以标记他们所研究的语言,所以国际音标也有很多种。
KK音标是国际音标的一种,DJ音标也是其中的一种。可是到了现在,这二种标准都已经过时落伍了。英国另一位语音学家A.C. Gimson(他是Daniel Jones的学生,英国伦敦大学的语音学教授),将英国英语的辞典发音做了一番修正(第13版,1977;第14版,1988),使它更能代表实际发音。
4.什么是严式标音和宽式标音?
严式标音和宽式标音的区别:
用音标标记语音的方法叫标音法。一般分为严式标音法和宽式标音法两种。 要记录一种语音,最初的方法应当是严式标音。
所谓严式标音,就是出现什么音素就记录什么音素,有什么伴随现象就记录什么伴随现象。无论什么音素和什么伴随现象都不放过,也就是最忠实、最细致的记录语音的原貌。所以,严式标音又称为“音素标音”。例如,现代汉语中,较低的舌面元音可归纳为一个音位/a/,若用严式标音,则必须分别标为[ε]、[A]、[a]、[ɑ]、[œ]、[æ]等。它的特点就是,对一种语言或方言中实际存在的每一个音素(不论它们是否属于同一个音位),都用特定的音标加以标记。因此,严式标音使用的音标很多,对语音的刻画描写很细致,大多是在调查第一手材料时使用,在其它场合只是间或使用。
所谓宽式标音,是在严式标音的基础上,整理处一种语音的音位系统,然后按音位来标记语音,也就是只记音位,不记音位变体及其它非本质的伴随现象。因此,宽式标音又称为“音位标音”。例如,现代汉语中,舌面低元音有[ε]、[A]、[a]、[ɑ ]等多个,用宽式标音只用/a/就可以了。用宽式标音,可以把音标数目限制在有限范围之内,因而能把一种语言或方言的音系反映得简明清晰。
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我们从小学就开始学习英语,然而很多人却仍学不好,所以英语基础知识扎实不扎实很重要,今天读文网小编在这里为大家分享英语基础知识大全,欢迎大家阅读!
1、人称代词、物主代词和反身代词
I—me—my—mine—myself you —you—your—yourself (yourselves)
he—him—his—his—himself she—her—her—hers—herself
it—it—its—its—itself we—us—our—ours—ourselves
they—them—their—theirs—themselves
人称顺序you, he, she, I ; we, you, they
主格作主语;宾格作宾语,动词和介词之后通常作宾格;形容词性物主代词不能单独使用,通常放在名词之前;名词性物主代词=形容词性物主代词+名词,“of+名词性物主代词”表示所属关系。A friend of mine我的一位朋友; teacher of hers她的老师
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下面是读文网小编整理的一些关于while 和 as在英语中的用法,欢迎大家阅读!
1. as...as的用法 as...as意为"和……一样",表示同级的比较。使用时要注意第一个as为副词,第二个as为连词。其基本结构为:as+ adj./ adv. +as。例如: (1)This film is as interesting as that one.这部电影和那部电影一样有趣。
其否定式为not as/so +adj./ adv. +as。例如: This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。 若有修饰成分,如twice, three times, half, a quarter等,则须置于第一个as之前。例如:
Your bag is twice as expensive as mine.你的袋子比我的贵一倍。
2. as用作连词引导时间状语从句,用as时,主句和从句的动作同时发生,强调伴随具有延续的含义。例如:
(1) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。
3. as用作连词引导原因状语从句 as一般放在句首,语气较弱,较口语化(1) Since you are so sure of it he’ll believe you.既然你对此如此有把握,他会相信你的。 As rain has fallen, the air is cooler.因为下过雨,空气比较清爽。
4. as作连词引导让步状语从句 ,as含义是"虽然,尽管",所表示的语气较强,引导的让步状语从句用倒装语序
Strange as it may seem, nobody was injured in the accident.这次意外虽然显得令人不可思议,却没有人受伤。
二、as作关系代词的用法关系代词as引导定语从句时,既可以单独使用,也可以与其他词连用,
1. as引导定语从句与其他词连用
①用于the same...as结构中
This is the same book as I read last week.这本书和我上周读的那本是一样的。
②用于such...as结构中 I don”t like such books as he recommends.我不喜欢他推荐的那些书。
③用于"so +adj. + a/an + n. (单数) + as "结构中 I am not so strong a man as I was.我已经没有从前那么强壮了。
2. as单独引导定语从句 as单独引导定语从句时,先行词可以是一个词,也可以是一个句子或短语。例如:
She is late, as is often the case.她迟到了,这是经常的事。(先行词是整个主句)
She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。
(2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见--你们好多人都是如此的愚蠢。(先行词是不定式短语)
三、as作介词的用法as作介词,意思是"作为","以……身份"。例如:
He came to China as a tourist five years ago.他五年前以游客的身份来过中国。
四、as作副词的用法"相同地","同样地"。例如:
They don’t have as many airplanes.他们没有同样多的飞机。
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下面是小编整理的一些关于provide 的用法,希望对大家有帮助。
英语provide 的用法详解:
1. provide against... 为......作好准备;预防......。
We should try our best to provide against the return of bird flu.
我们应该尽最大努力来预防禽流感的再次发生。
2. provide for 提供生活费,养活。
He provided for his family by selling newspapers.
他靠卖报来养活他的家人。
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相信很多人在英语的学习中,语法是一个大问题吧!下面是读文网小编归纳的一些关于冠词的常见用法,希望这些冠词英语语法能帮到大家!
1.用在姓氏复数前,表示一家人。The Greens are at table.
2.用在年代、朝代名词前或用在世纪或逢10的复数年代前。(在某人50多岁时用in ones 50s)
A great many important events took place in the 1900s.
The Tang Dynasty(唐朝)
3.用在表示计量单位的名词前。 Apples are sold by the kilogram.
但如果是单位名词的总称,名词前不用冠词,如:
by weight; by time; by length
Fruit is sold by weight.
4.特指双方都明白的人或者事物。Take the medicine.
5.指上文提到过的人或者事物。He bought a house. I’ve been to the house.
6.指世界上独一无二的事物。
the sun, the Internet, the moon, 但space前没有冠词
7.与形容词或分词连用,表示一类人或者一类事物。
the rich, the wounded, the new
8.用在表示乐器的名词前,但中国乐器前没有定冠词 play the piano, play erhu
9.用在序数词、形容词最高级以及形容词only, very, same前面
She is always the first to come and the last to leave.
10.动词+sb.+介词+the +身体的某一部位
take sb. by the arm 抓住某人的手臂 hit sb. in the face打某人的脸
11.用在the more…,the more…结构中,表示“越……越……”(more指形容词的比较级)
The harder you study, the better you will learn.
12.用在发明物的单数名词前,既表示特指又表示类别。
Bell invented the telephone in 1876.
13.固定短语
on the whole, in the way, go to the theatre/cinema, to tell the truth, all over the world, in the distance, in the form of
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hit有打(击);袭击;达到等意思,那么你知道hit的过去式是什么吗?下面跟着读文网小编一起来学习一下hit的过去式和用法例句_hit的英语知识,希望对大家的学习有所帮助!
1. As I sidestepped, the bottle hit me on the left hip.
我侧一步要躲闪的时候,瓶子打中了我的左髋部。
2. If something's a sure-fire hit then Radio One will play it.
如果哪首歌一定会火,那么第一频道肯定会播出。
3. He pushed everyone full speed ahead until production hit a bottleneck.
他催促所有人拼命干活,直到生产遭遇瓶颈。
4. He hit back angrily, saying such remarks were childishly simplistic.
他愤怒地反击,说这些话太过幼稚。
5. New $750,000 infomercials, featuring artists like Cher, have recently hit the screens.
耗资75万美元、有雪儿等艺人出镜的新的名人电视促销节目近来播出了。
6. As he tried to crawl away, he was hit in the shoulder.
他试图爬走时肩膀中枪了。
7. He hit her on the head, causing her too to spurt blood.
他击中了她的头部,她也开始流血。
8. His jaw was broken after he was hit on the head.
他的头部受重击之后下颌骨折了。
9. The dug-outs were secure from everything but a direct hit.
除非是直接被击中,否则这个地下掩体是非常安全的。
10. When they hit the rocks, they were just 500 yards offshore.
他们触礁时离海岸仅有500码。
11. An earthquake hit the capital, causing panic among the population.
首都发生了地震,引发民众恐慌。
12. Graham hit him across the face with the gun.
格雷厄姆用枪击打他的脸部。
13. He admits to having hit the lowest point in his life .
他承认自己跌到了一生中的最低谷。
14. Leatherdale was hit resoundingly on the side of the head.
莱瑟戴尔头部一侧遭到响亮的一击。
15. The infantry would use hit and run tactics to slow attacking forces.
步兵团可能会使用打了就跑的战术来阻滞进攻部队。
hit的过去式和用法例句英语知识相关
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下面是小编整理的一些关于英语中形容词用法总结,希望对大家的英语学习有所帮助。
1)形容词词干十名词十 ed
kind- hearted(好心的)
2)形容词词干十形容词词干
red- hot(炽热的),dark- blue(深蓝的)
3)形容词词干十现在分词词干
tried- looking(面带倦容的) ordinary- looking(长相一般的)
4)副词词干十现在分词词干
hard- working(勤劳的) quick- firing(速射的)
5)副词词干十过去分词词干
hard- won(得来不易的) newly- made(新建的)
6)名词词干十形容词词干
life- long(终生的) world- famous(世界闻名的)
7)名词词干十现在分词词干
peace- loving(爱好和平的) mouth- watering(令人垂涎的)
8)名词词干十过去分词词干
snow- covered(白雪复盖的) hand- made(手工的)
9)数词词干+名词十 ed
four- storeyed(四层的) three- legged(三条腿的)
10)数词词干十名词词干
ten- year(十年的) two- man(二人的)
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分词做状语,在我们的英语表达里有何用法与见解呢?下面是小编为大家整理的关于分词作状语用法知识点详解和辨析_分词作状语用法知识点,希望对您有所帮助。欢迎大家阅读参考学习!
分词作状语用法知识点详解和辨析知识点相关
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aspect一般有方面;方位;外观;外貌等意思,那么你知道aspect的用法吗?下面跟着读文网小编一起来学习一下aspect的用法大全_aspect的知识,希望对大家的学习有所帮助!
aspect的用法大全知识相关
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小编给大家整理了英语词组 doing/to do 的固定用法,希望对大家的英语学习有帮助。
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性,真实性;
+doing 表示动作的连续性,进行性
I saw him work in the garden yesterday.
昨天我看见他在花园里干活了。(强调"我看见了"这个事实)
I saw him working in the garden yesterday.(强调"我见他正干活"这个动作)
昨天我见他正在花园里干活。
1)They knew her very well. They had seen her ___ up from childhood.
A. grow B. grew C. was growing D. to grow
答案:A。
因题意为,他们看着她长大,因此强调的是成长的过程,而非正在长的动作,因此用see sb do sth 的句型。
2)The missing boy was last seen ___ near the river.
A. playing B. to be playingC. playD. to play
答案A. 本题强调其动作,正在河边玩,应此用see sb. doing sth句型。
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下面是小编整理的一些关于until的用法详解,欢迎大家阅读!
1.可直接换用的情况:在until能使用的句型中,即主句含有否定式终止性谓语动词或肯定式延续性动词,可与before直接替换,意义差别不大。如:
①The students won't go home until / before they finish their homework.学生们要先完成作业才能回家。
②The woman worked in the factory until/before 1990. 1990年以前这妇女在这家工厂上班。
2.不可换用的情况:当主句含有肯定式终止性谓语动词时,只能用before不能用until,且before常意为"没来得及……"或"……才……"等。如:
③Einstein almost knocked me down before he saw me.爱因斯坦差不多将我撞倒才看见了我。
④He had measured me before I could get in a word.我还没来得及插话,他就把我的尺寸量好了。
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