[用一个实例讲解Oracle的自定义聚集函数要注意什么]Oracle数据库的定制功能十分强大。Oracle不但允许用户定制自己的函数，还可以定制自己的聚集函数和分析函数。 本文将着重介绍使用自定义聚集函数建立一个字符串“sum”的示例...+阅读

一般来说，倒装分为全部倒装和部分倒装，有的倒装是因为语法需要而出现的，有的倒装则是因为结构平衡的需要而出现的。

一、完全倒装（主谓倒装）是指把谓语全部提到主语的前面。 例：In the harbor sits Denmark＂s bestknown landmark,the Little Mermaid 1.以here, there,now, then引导的句子，要完全倒装。这种句子中的谓语动词通常是不及物动词。 如：Here comes the train! / There goes the bell！ 注意：若代词作主语，只把该副词提前主谓语序不变。Here he comes . / Here it is . 2句首是拟声词或 out , in , up ,away , down 等副词，句子要完全倒装。（注意，这时句子的主语也必须是名词。如果是人称代词，也不能使用倒装结构。） 如：Up went the rocket. /Up it went. 3. 介词短语作状语在句首，句子要完全倒装。注意，这时句子的谓语动词通常是不及物动词。 如：In the front of the lecture hall sat the speaker. 4.表语置于句首，且主语较长或结构较复杂的句子要用全部倒装。如：Gone are the days when we ha nothing to eat. 5.so/ neither/ nor 表前面所说的情况也适合于后者，其倒装结构为“so/ neither/ nor+助动词/系动词/情态动词”，这里的主语同前一个句子的主语指的是同一人或物。如：She has finished her homework, so has her brother. She hasn't gone there, neither/ nor has he.

二、部分倒装（助动词倒装）是指把谓语的一部分（助动词）提到主语的前面。 例： Never in my life have I seen such a thing. 1.用于疑问句中。如：How did you do that? Did you see the film yesterday? 2. if 从句中如有 were ( had , should ) , if 省去后，要部分倒装，把were,had,should提到主语前面。如： If you had come yesterday, you would have seen him. ---Had you come yesterday, you would have seen him. 3.as 引导的让步状语从句，要部分倒装（表语、状语倒装）。有以下几种形式： 1） 副词置于句首。如：Much as I like it (=Although I like it very much), I will not buy it. 2） 动词置于句首。如：Wait as you may (= Although you may wait), he will not see you. 3） 形容词或名词置于句首。如：Proud as the nobles are (=Although the nobles are proud), they are afraid to see me. Child as he is (=Although he is a child), he can tell right from wrong. 注意：如果名词前有形容词修饰时，as引导的倒装句中要保留不定冠词。如： A bad-tempered man as he is (=Although he is a bad-tempered man), he loves me deeply. 4.句首为否定词或否定意义的词语时，句子要部分倒装。（ not , not only , never , little , seldom , not until, hardly ( scarcely ) , no sooner, not once, at no time,... ) Little do we know about him. No sooner had he closed his eyes than he fell asleep. Seldom does he come back on Sundays. Not until he came back did I know about it. 5.only 在句首引导状语，或not until 引导的状语在句首，主句要部分倒装。如： Only then did I realize the important of English. / Only when a child grows up does he understand his parents' intentions. 但若only修饰的是句子的其它成分，则无需倒装。如：Only socialism can save China. (only修饰句子的主语，仍用正常语序) 6.not only ... but also ... 引导两个并列句，前倒后不倒。如： Not only does he do well in his lessons, but also he often helps others with their lessons. 7.在以often, well, many a time, now and again等方式或频度副词（短语）开头的句子中，要用部分倒装结构 Many a time has John given me good advice. / Often have we made that test. 8. 用于某些表示祝愿的句子里。May you succeed! 9. so或so引导的短语放在句首，要部分倒装。 So loudly did he speak that even people in the next room could hear him. so…that结构中的倒装。有时要强调so 所修饰的形容词或副词，常将so连同它所修饰的形容词或副词一起提到句首。这时，主句要用倒装结构。如： He runs so fast that he is far ahead of others.---So fast does he run that he is far ahead of others. He is so clever that he can work out all the difficult problems in the book. --So clever is he that he can work out all the difficult problems in the book.（全部倒装） 10.状语位于句首表示强调或使句子平衡，或使上下文紧密衔接，句子要部分倒装。 倒装句的用法 1 . 在以 here , there , in , out , up , down , away , back , now , then 等副词开头的句子里，如果主语是名词，常用全部倒装。 Out rushed the boys . /Then followed three days of heavy rain . 若代词作主语，只把该副词提前主谓语序不变。Here he comes . / Here it is . 2 . 当句首状语是表示地点的介词词组时，也常常引起全部倒装。 South of the city lies a big steel factory . 3 . 以带有否定意义而且修饰全句的词开头的句子，要用“部分倒装”语序 （ 倒装的方法跟变一般疑问句的方法相似 ） 。这类常见词有 never , hardly , seldom , not , not only , not until （ 引导从句时，主句“部分倒装” ） ，little , rarely , no sooner . . . than , hardly . . . when , scarcely . . . when。 涪穿帝费郜渡佃杀顶辑 例：Never shall I do ...

英语倒装句讲解

1. “某些副词+不及物动词+主语”的句式，需要全部倒装。常用的副词主要有：here , there , now , then , out , in , down , up , away 等，表示强调。主语是代词时，不必倒装。 Out rushed the boy . Down came the brown wave . 2. 表示方位的短语放在句首，后面一般使用倒装语序。 West of the lake lies the famous city . 3. There be + 主语+地点。其中动词be也可以是其他词，如lie,stand等。 There are many different kinds of mooncakes on the table . There in Greece lived a famous thinker , named Aristotle . 4. 如果直接引语后注明是什么人说的，而且主语是名词时，需要完全倒装；主语是代词时，一般不用倒装。 “Let”s go ! ”said the captain . “Take off your boots !” ordered the guard . 5. 为了保持句子平衡，或为了强调表语或状语，或使上下文紧密衔接时。

They arrived at an old church , in front of which stood a big crowd of people . 6. 用于so开头的句子，表示重复前面相同的内容，意为“也怎么样”。另外，在结果状语从句句型so …that …中，如果强调so…放在句首，主句需要部分倒装。 I often go out for a walk after supper . So does she . 我经常在晚饭后出去散步，她也这样。 So excited was she at the news that she couldn”t say a word .听到这个消息，她是如此激动，以致于一句话也说不出来。 7. 用于nor , neither 开头的句子，表示重复前面相同的内容，“也不怎么样”。 Li Lei can”t answer the question . Neither can I . If you don”t wait for him , nor shall I . 8. only放在句首，强调状语（副词，介词短语或状语从句等），全句语序要部分倒装。 Only in this way can we get in touch with them . Only because he was ill was he absent from school . 注意：only放在句首，强调主语时，语序不必倒装。

Only Mr Wang knows about it . 9. 带有否定意义的词放在句首，语序需要部分倒装。常见的词语有： not , never , seldom , scarcely , barely , little , at no time , not only , not once , under on condition , hardly … when , no sooner …than ……等。 Little did I think he is a spy . 我一点也没想到他是一个间谍。 Hardly had I reached home when it began to rain . No sooner had I entered the room than the phone rang . 10. 在虚拟语气中，倒装代替条件。 Should he be here next week , he would help us with the problem . Were there no light , we could see nothing . 11. 用于某些表示祝愿的句子。 May you succeed ！ 祝你成功！ Long live France ！ 法兰西万岁！

英语倒装句详细讲解

倒装语序分为“全部倒装”和“部分倒装”。在全部倒装的句子中，整个谓语都放在主语的前面；在部分倒装的句子中，只是谓语中的一部分（如助动词、情态动词或系动词be等）放在主语前面，其余部分仍放在主语后面。下面将常见的倒装情况分述如下：

由there, here 或now 等引起，谓语为come

（或go）的句子

如果主语为人称代词，仍用自然语序

There comes the bus! There goes the bell!

Here comes Mary! Now comes your turn

There he comes!

Here she comes!

由here（或there）引导，谓语为be的 句子

Here you are. / Here we are.

Here it is. / There he is.

如果主语为人称代词，仍用自然语序

Here is China's largest tropical forest.

Here are some picture-books

“We must start for the work-site now.”

- “So must we.”

Society has changed

and so have the people in it.

由so引起的，表示前面所说的情况也适用于另

一个人（或物）的句子

-- It was cold yesterday. – So it was!

-- Tomorrow will be Monday. – So it will.

如果一个句子只是重复前面一句话的意思，

尽管so用开头，语序也不要倒装

1. -- I won't do such a thing.

–Neither / Nor will I.

2. If you won't go, neither shall I.

3. -- I haven't done my homework.

–Neither / Nor have I.

4.I didn't read the notice on the bulletin

board, nor did he.

由neither或nor引起的，表示前面所说的情况

也适用于另一个人（或物）的句子

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