英语学习.什么是periodic sentence掉尾句和loose sentence松散句?

英语学习.什么是periodic sentence掉尾句和loose sentence松散句?

periodic sentence掉尾句
把重要的信息放在句子的未尾,一般是谓语部分,当然不一定全是
如：At last, with no small difficulty, and after much fatigue, through deep roads and bad weather, we came to our journey's end.
很明显句子的重点是we came.而他在句子的尾部,所以是掉尾句
百度百科的解释如下：
掉尾句就是中心意思放在句尾的句子.这种句子结构通常比中心意思放在句首,修饰语放在句尾的结构效果更好.作修饰语的成分,可以是词组,如介词词组和分词词组等；可以是状语从句,如条件状语从句、让步状语从句或时间、地点状语从句等；也可以是其它结构,如不定式结构等.因而要读完全句才能了解该句完整含义的句子结构；从语法上看,掉尾句是一个不可分割的语言单位.通俗地讲,“掉尾”即“吊胃口”,制造“悬念”,起到引人入胜、发人深思的作用.
【范例分析】
（1）.Although she was interested in music, she finally decided to study English.
（2）.It is universally acknowledged that a single man in possession of a good fortune must be in want of（没有,需要）a wife.
（3）.According to newspaper reports,after winning the Olympic gold medal for figure skating, she was offered a professional contract.
（4）.In the nineteen-fifties, for reasons that were never revealed to me, for my relations with academic administration have often been somewhat painful, I was made a trustee(理事)of Redcliff College.
（5）.John, office manager, staff supervisor, and report writer, is crucial to the company’s success in Beijing.
上面的五个句子都是掉尾句,中心意思都放在了句末,只有读完才能明白全句的意思,使读者产生一种期待效应.例句2是由that引导的从句作真实主语,例句3主句前有两个介词短语作状语,例句1主句放在让步状语从句后,例句4的主句前有两个介词短语（后一个还包括由that引导的定语从句）以及一个由for引导的原因状语从句修饰. 例句5的主语后接了三个同位语.掉尾句的特点是把整句的主要部分（如复合句的主句或主句的主要部分）置于末尾处,形成整句的高潮,从而达到突出该部分内容的目的,所以,掉尾句属于一种修辞强调句.因此我们把掉尾句看成是比较正式的书面语,结构上没有固定模式,多数情况下是把较长的状语提前,而把较短的主句留到最后.
Loose construction（松散句）
【内容讲解】
松散句是一种组织松弛的句子.它的组成部分可以比较自由地拆散,在句中的某些地方,可以随意停顿,而且语法上具有一定的完整性.中心意思放在句首,修饰语放在句尾.这种句子中心意思不突出,整个句子结构比较松散.松散句的特点是：自然、轻松、流畅、易懂.
【范例分析】
（1）.He was sitting before the fire in a large armchair when we entered.
（2）.The course was not very difficult, although I didn’t receive a high grade.
（3）. She was offered a professional contract after winning the Olympic gold medal for figure skating, according to newspaper reports.
这三个句子都是把时间状语、让步状语以及介词短语后置,构成松散句.其实掉尾句与松散句各有千秋,交替使用可以增添节奏的变换,避免单调.
【重点难点】
大多数的松散句,不论是简单句还是复合句,都可以通过把状语或从句移动至句首的方法改成掉尾句.句首和句尾是突出中心思想的最佳位置.我们可以运用松散句和掉尾句来实现这一目的.此外还有许多其他的方法：如运用主动语态、巧妙重复关键词、用标点、单句将主要概念隔开以及使用简洁的文字等.例：
松散句：Canada is certainly a less violent place than the United States, since in the U.S. a violent crime is committed every thirty-one seconds, compared with one every four minutes in Canada.
掉尾句：Since in the U.S. a violent crime is committed every thirty-one seconds, compared with one every four minutes in Canada, Canada is certainly a less violent place than the United States.
松散句：Don’t order spaghetti when you go to an important business lunch, where you must present a neat, efficient controlled image.
掉尾句：When you go to an important business lunch, where you must present a neat, efficient controlled image, don’t order spaghetti.
求采纳~~谢谢~~~