定语从句(Ⅱ)
编稿：陈玉莲审稿：
概念引入
The lab where the chemist often does experiments is not far from here
化学家做实验的那个实验室离这儿不远
I've always longed for the days when I should be able to be independent
我非常渴望我能够独立的那天
There are moments when I forget all about it.
那个时候我忘记了所有的一切
He wanted to know the reason why I was late.
他想要知道我迟到的理由
语法点拨
【高清课堂：定语从句二 P3】
where引导的定语从句
先行词为名词，但是加上介词后可以在从句中充当地点状语。
We will start at the point where we stopped. 我们从上次停止的地方开始吧。
分析从句的成分：主语为we, 谓语为stopped，并且此处stop为不及物动词，从句不需要宾语。先行词加上介词at在从句中做地点状语。注意此处的at并不是主句中的at，而是根据从句的逻辑意义增加的介词at，相当于at which we stopped.
The building where he lives is very old. 他住的这栋建筑很老旧。
Put it at the place where you have found it. 把它放在你发现它的地方。
分析从句的句子成分，主谓宾齐全，结构完整，先行词在从句中充当地点状语。
The city where we spent our holidays is very beautiful. 我们度假的那座城市很漂亮。
分析先行词和从句的关系，“我们在这个城市度假”，where相当于in the city，作从句的地点状语。
Shanghai is the city where I was born. 上海是我出生的从城市。
I visited the farm where a lot of cows were raised. 我参观了那个养了很多奶牛的农场。
This kind of plant grows best at the places where it is warm and wet．
这种植物在温暖潮湿的地方长得最好。
—
What do you think of teacher, Bob？ Bob，你认为老师这种职业怎么样？
—I find it fun and challenging. It is a job where you are doing something serious but interesting.我发现它有趣而有挑战性。这是一份你做着严肃而有趣的事情的工作。
It’s helpful to put children in a situation where they can see themselves differently.
把孩子们放在一个他们能以不同方式看待自己的地方是很有帮助的。
When引导的定语从句
当先行词在定语从句中的成分是时间状语的时候，连接词就是when，而且先行词通常是time, day, night, moment等等表示时间的名词。
forget He was born in the year when the earthquake took place. 他出生在地震发生的那一年。
分析从句句子成分：主语the earthquake，谓语took place，无需宾语，先行词the year在从句中只能加上介词in充当从句的时间状语，所以用表示时间状语的when/in which。
注意：the year前的介词in为主句中的介词，跟从句无关，从句中的in是分析先行词和从句的逻辑关系而得出的。
She looked fine at the time when I saw her.我看到她的时候她看起来不错。
先行词time加上介词在从句中做时间状语。
July is the month when the weather is usually the hottest.
七月通常是天气最热的一个月。
Tell me the time when he was killed. 告诉我他被杀的时间。
Please let me know of the day when you will arrive in Beijing.
请告知我们你将到北京的时间。
The time when we got together finally arrived. 我们团聚的时刻终于来到了。
She’ll never forget her stay there when she found her son who had gone missin
g two years before. 她永远都不会忘记那次停留，那时他到了两年前失踪的儿子。
Between the two parts of the concert is an interval, when the audience can buy ice-cream.
音乐会两部分之间有中场休息，观众在那时可以买点冰淇淋。
Why引导的定语从句
当先行词在定语从句中的成分是原因状语的时候,连接词就是why，而且先行词通常是reason。
That is one of the reasons why I hate you.这是我讨厌你的原因之一。
先行词the reasons加上介词for在从句中做原因状语，介词for是从句的逻辑关系补充的。从句补全为：I hate you (for) the reasons.
The reason why he changed his mind is not clear. 他改变主意的原因还不清楚。
同理，the reason在从句中做原因状语。
Do you see any reason why he refused to help?你明白他拒绝帮忙的理由吗？
I want to know the reason why he left so early. 我想知道他这么早离开的原因。
The time when I first met Nelson Mandela was a very difficult period of my life.
我首次遇到曼德拉的时候是我一生中很艰难的时候
但要注意，连接词的选择不能只看先行词的内容，最关键的就是看先行词在从句中的成分。
有同学一看到先行词是表示地点的名词，选择where；看到先行词为表示时间的名词，选择when；看到先行词为reason，选择why；这种做法是不对的，关键是看先行词在从句中做哪种成分。
比较下面句子：
March 22 is the day when I was born. 3月22号是我出生的那一天。（先行词the day在从句中作时间状语：I was born on the day.）
March 22 is the day (which/that) I will never forget. 3月22号是我永远不会忘的一天。
（先行词the day在从句中作forget的宾语：I will never forget the day.）
Would you please tell me the reason why you are late again for work?
你能告诉我你又一次迟到的原因吗？
Would you please tell me the reason which/that at least sounds true this time?
你能告诉我这次听起来更真实点的原因吗？
I saw them in the park where a lot of people were singing.
我在那家有很多人唱歌的公园里看到他们。
I saw them in the park which/that was built 10 years ago.
我在那家十年前建好的公园里看到他们的。■
The Science Museum, which we visited during a recent trip to Britain, is one of London’s tourist attractions. 我们上次去英国参观的科学博物馆是伦敦的旅游景点之一。（
先行词the Science Museum 在从句中作主语。）
The reason that you gave me just now was just an excuse.
你刚才给我的理由只是一个借口。（先行词the reason在从句中宾语。）
定语从句中关系代词和关系副词的选择
1. 明确关系代词和关系副词在定语从句中的不同作用：关系代词which, that, who在定语从句中作主语或在及物动词和介词后作宾语。关系副词when, where, why在定语从句中作状语。
The old town has narrow streets and small houses which are built close to each other. (从句部分缺主语，填入关系代词)
Whatever is left over may be put into the refrigerator, where it will keep for two or three weeks.（从句部分的谓语keep为“保存好”的意思，不带宾语，填入关系副词）
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