Period 3 Grammar and usage—Restrictive relative clauses with relative adverbs 阅读以下短文，感知加黑部分，并完成文后的练习 Do you remember a time ①when you had no worries stopping you from getting a good night’s rest Unfortunately，your happy childhood is probably a thing of the past. A recent study has found that many people suffer from sleep problems.Some are unable to fall asleep，some wake up in the middle of the night，and others simply do not get enough sleep.One of the reasons ②why people fail to get a good night’s sleep is pressure from school or work.Noise pollution and light pollution in big cities may also contribute to sleep problems.In the short term，people with sleep problems often feel tired and have trouble concentrating.In the long term，they may be at increased risk of having a poor memory，being overweight and suffering a heart attack.Sleep problems are especially dangerous for teenagers.They are still growing and night is the time ③when their bodies grow faster.Teenagers who do not sleep well may experience situations ④where body development slows down，and their health suffers. So，if you have trouble getting a good night’s sleep，it might be time to make some changes in your lifestyle. 以上加黑的定语从句的关系词都是关系副词，它们分别是：when，where，why。这些词在从句中都作状语，如果先行词是表示时间的名词，关系副词要用 when，如：①③；如果先行词是reason，关系副词要用 why，如：②；如果先行词是表示地点的名词或抽象的地点名词如situation，stage等时，关系副词要用 where，如：④。 一、关系副词的指代及功能 当先行词在定语从句中作状语时，通常要用关系副词引导定语从句。常用的关系副词有when，where，why等。 1．关系副词when when引导定语从句时，先行词往往是表示时间的名词(如time，day，week，month，year等)，关系副词when在从句中作时间状语。有时when＝in/at/on/during...＋which，具体用哪个介词，要根据先行词的搭配来确定。 There used to be a time when(＝during which) I was under a lot of pressure. 曾有一段时间我压力很大。 I’ll never forget the day when(＝on which) I played the piano for the first time. 我永远不会忘记我第一次弹钢琴的那一天。 2．关系副词where where引导定语从句时，先行词往往是表示地点的名词(如place，room，house，spot等)，关系副词where在从句中作地点状语。有时where＝in/at/on...＋which，具体用哪个介词，要根据先行词的搭配来确定。 They are playing in the park where(＝in which) there are many flowers. 他们正在有很多花的公园里玩耍。 The office where(＝at which) the guy works is not far from here. 这个小伙子工作的办公室离这里不远。 [疑难点津] 有一些先行词，如point，stage，position，case，condition等，属于抽象的地点名词，如果定语从句中缺地点状语，需用where引导。 You will reach a point in any project where you just want to get the thing finished. 在任何一个项目中，你都会达到一个你只想把事情做完的阶段。 You would get into a position where you have to decide immediately. 你会陷入一个必须立即做出决定的境地。 3．关系副词why why引导定语从句时，先行词常为reason，关系副词why在从句中作原因状语。可用for which代替。 Can you explain the reason w ... ...
