duringfor的区别和用法
  duringfor 介词for引导时间状语时,很易和during混淆不清。
它们的区别如下:
(一) during用在已知的时期、节日或表示时间观念的名词之前,其后通常接thethisthatthese 
thosemyyourhis……等词
例: during the last four daysthe spring of 1995 during the  winterwareconomic crisis 
of 1929 during that timethe course of the play during my holidayssummer vacation 
during her absenceinterview during our  stay in Japantheir visit here
    for则用以表示有限的无限的时间概念,通常其后接冠词、数词,复数名词或副词ever
  例如:during spring怎么读 for the first timea timea while for a couple of weeksdays for two
  monthsweeks for many yearsgenerations for yearsmonths for everages
(二) during的涵义是……之际,它既可指某个动作在某个时期里连续不断地进行,也可以指某   
个动作在这段时期里的某个时间发生。
如: He was sick for a week and during that week he was placed in an infirmary  他病了一个星期,在这个星期里,他住在护养院。
It snowed all day but stopped snowing during that night 下了一整天雪,到晚上才停了。  for的涵义是指某个动作在某个时期里处于连续不断的状态。
如: They worked for the whole day 他们干了一整天。
  在某些场合下,for含有预先安排为了某一目的之涵义。表示此意味时,大都和comegostaylendrenthire等词连用。
例: I went to Europe for the holidays 我到欧洲度假去了。
They will stay with us for the New Year 他们将和我们在一起,共度新年。
We're off for our honeymoon 我们要去度蜜月。
May I borrow your camera for Christmas 我可否借你的照相机在圣诞节时使用
After graduating in 1665, Newton planned to study for a master's degree, but the university was closed due to an outbreak of the plague. He returned to his home village for 18 months, during which time he did most of the thinking that led to his later work on gravitation and optics.
这是Relax and Fun听力练习中的内容
during 是定语从句, which 是关系代词, 在从句中作定语修饰time,
(which time )一起作介词during的宾语, 介词短语during which time在定语从句中作时间状语?

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