1、 Unit 4 Unit 4 Grammar and usage Lack enough sleep time.Cannot fall asleep even if you are very sleepy.Often wake up suddenly in the midnight.Have dreams all the night and feel more tired.What factors may lead to sleep problems?Suffer from too much stress.Eat too much or too little.Face a new enviro
2、nment.Have extreme feelings.Have too much noise.Watch frightening films.Some illnesses Grammar and usage:Think and shareHow do sleep problems affect our life?Feel sleepy and tired in the day.Dont concentrate in class/work.Have a poor health/body/memory/appetite.Have depressed feelings.Have a dull sk
3、in.Be slow in thinking.Be overweight or very thin.Grammar and usage:Think and shareBelow is part of a magazine article about sleep problems.Find out the structure of it after reading carefully.Grammar and usage:Read the passage on P48IntroductionDetailed informationConclusionWhat are sleep problems?
4、Causes of sleep problemsBad effects of sleep problemsThe seriousness of sleep problems for teenagersIf you are asked to go on with the article,What will be talked about in the next paragraph?Advice on how to make changes in life to deal with sleep problems.Grammar and usage:Brain storm(P48)限制性限制性定语定
5、语从句从句 (restrictive relative clause)指指修饰名词、代词或名词短语的从句修饰名词、代词或名词短语的从句,对所修饰的对对所修饰的对象加以限制，象加以限制，表示表示“的的(人人)或或的的(物物)”)”。从句不可去掉，一旦去掉主句的意思则不完整。从句不可去掉，一旦去掉主句的意思则不完整。被被修饰的名词、代词或名词短语称为修饰的名词、代词或名词短语称为先行项先行项或或先行词先行词(antecedent)。由关系代词引导的限制性定语从句由关系代词引导的限制性定语从句名词可以被形容词，介词短语，非谓语动词等修饰。如果要表达稍微复杂一点的意思，简单形容词或者介词短语等不能满足
6、，要借助一个句子来修饰名词。I like diligent studentsI like students who finish their homework carefullyA real friend is someone who walks in when the rest of the world walks out.A real friend is someone whose support we can count on.A real friend is someone who sees our true self,not just the face that we show to
7、 the world.Yet these days,the modern tools that keep us connected are eating away at the meaning of friendship.Social media like blogs has come between us and the friends whom we love.“Sharing”our experiences on social media is not enough to express the values which matter most to us.“Liking”our fri
8、ends photos online does not develop the connection which we share.Please underline the restrictive relative clauses in this article.(when,where,why,who)Grammar and usage:Read and underline (P48)that/whichwhenP48wherethat/whichwhy/for which1.a thing of the past 2.contribute to 3.in the short/long term 4.be at the risk of doing 5.a large amount of 6.the amount of7.stick to the sleep schedule Important language pointsGrammar and usage已成为过去已成为过去促成，造成促成，造成从短期从短期 /长期看长期看冒做某事的风险冒做某事的风险大量的大量的的数量的数量严守作息严守作息
