VOA慢速英语:In Haiti, a Struggle to Get Crops in the Ground

when引导定语从句

由关系副词when, where, why引导的定语从句 1)基本用法.定语从句除可用关系代词引导外，还可用关系副词when, where与why来引导，它们的区别是：when用于指时间，where用于指地点，why用于指原因。when, where, why 在定语从句中均用作状语。如：1980 was the year when he was born. 1980是他的出生年。This is the town where I was born. 这就是我出生的城市。This is the town where I was /SPAN>
These are the reasons why we do it. 这些就是我们这样做的理由。

2)先行词问题关系副词when关系副词宋体>和where的先行词是表示时间(如the day, the days, the time, the year等)和地点(如the place, the house, the factory, the station等)的一类词，而关系副词why的先行词通常只是whythe reason(s)。另外，when和where可引导限制性和非限制性定语从句，而why则只用于引导限制性定语从句，不用于引导非限制性定语从句。

3)一点注意注意不要以为在时间名词后就一定用关系副词when，在地点名词后就一定用关系副词 where，在表示原因的the reason后就一定用关系副词why。到底选用关系副词还是关系代词，关键是看它们在定语是用作状语(用关系副词)还是用作主语或宾语(用关系代词)。如：Don’t forget the time (that) I’ve told you. 不要忘记我告诉你的时间。(that用作told的宾语)I’ll never forget the days when I worked with you. 我永远不会忘记我与你共事的日子。(when用作状语)He works in a factory that [which] makes radio parts. 他在一家制造无线电零件的工厂工作。(that, which 在从句中用作主语，且不能省略)He works in the factory where his father worked. 他在他父亲工作过的那家工厂工作。(where作状语)That’s the reason that [which] he explained to us. 那就是他向我们解释的理由。(that或which在从句中用作explained的宾语)
That’s the reason why she left home. 那就是她离家出走的原因。(where在从句中作状语)

2.An estimated six hundred thousand people left for the countryside.

leave for出发去(某地)

例句：We'll leave for Guangzhou by plane.
      我们将乘飞机去广州。

      We're leaving for Rome next week.
      我们下星期要到罗马去。

3.Professor Murray says many rural families have taken in relatives and friends who lost homes and jobs.

take in接待; 收留

例句：He had nowhere to go, so I took him in.
      他无处可去, 所以我收留了他。

      My house is full; I can't take in any more guests.
      我的房子已客满, 不能再容纳更多的客人了。