【优化方案】（广东专用）高中英语 Unit15 Section Ⅳ Grammar & Writing精品课件 北师大版必修5.ppt

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1、Section Grammar&Writing语法精讲专项突破语法精讲专项突破类别类别例句例句If引引导导的的条件从句条件从句If he were here，he would help us.If I had been free，I would have visited you.If it should rain tomorrow，we would not go camping.其它状其它状语语从句从句They are talking as if they had been friends for years.Turn on the light so that we can see it cl

2、early.品味语法品味语法品味语法品味语法类别类别例句例句宾语宾语从句从句He suggested that we not change our mind.I wish I could be a pop singer.主主语语从句从句It is strange that such a person should be our friends.其它其它句型句型Its high time that we left.I would rather you stayed at home now.If only our dream had come true！虚虚拟语拟语气气1.虚拟语气在条件句中的用法

3、虚拟语气在条件句中的用法讲解归纳讲解归纳讲解归纳讲解归纳虚虚拟拟情情况况从句从句谓谓语语主句主句谓语谓语例句例句备备注注与与现现在在事事实实相相反反过过去式去式(be用作用作were)would/should/could/might doIf he were here，he might be able to help.要是要是他在他在这这里，里，可能就帮上可能就帮上忙了。忙了。What would you do if you were in his place？要？要是你是你处处在他在他的位置，你的位置，你会怎么会怎么办办？(1)条件从句中有条件从句中有时时可省略可省略if而采用倒装而采用倒装

4、结结构，构，将将should，were或或had提到主提到主语语之前。如：之前。如：Had it not been for your help，we wouldnt have achieved so much.要不是由于你要不是由于你们们的帮助，我的帮助，我们们就不会取得就不会取得这这么么大的成就。大的成就。(2)介介词词(短短语语)without/but for、连词连词but、副、副词词otherwise等常用来表示某种假等常用来表示某种假设设条件。如：条件。如：I wouldnt have made such rapid progress without your help.没有你的帮助

5、，我不会取得没有你的帮助，我不会取得这这么快的么快的进进步。步。(3)有有时时候从句和主句候从句和主句动动作作发发生的生的时间时间不一致，不一致，这时谓语动词这时谓语动词的形式要根据具体的的形式要根据具体的时间时间来来调调整。整。如：如：If the weather had been more favourable，the crops would be growing still better.如果如果(过过去去)天气好一些，天气好一些，(现现在在)庄稼庄稼还还会会长长得更得更好。好。虚虚拟拟情况情况从句从句谓语谓语主句主句谓谓语语例句例句备备注注与与过过去事去事实实相相反反had donew

6、ould/should/could/might have doneIf I had started a little earlier，I would have caught the train.要是我早要是我早点点动动身身,就赶上火就赶上火车车了。了。She would have come if she hadnt been so busy.要不是忙她要不是忙她就来了。就来了。I could have done it better if I had been more careful.我要是更我要是更仔仔细细点的点的话话,是能是能够够做得更好的。做得更好的。(1)条件从句中有条件从句中有时时可

7、省略可省略if而采用倒装而采用倒装结结构构,将将should，were或或had提到主提到主语语之前。如：之前。如：Had it not been for your help，we wouldnt have achieved so much.要不是由于你要不是由于你们们的帮助，我的帮助，我们们就不会取得就不会取得这这么大的成就。么大的成就。(2)介介词词(短短语语)without/but for、连词连词but、副、副词词otherwise等常用来表示某种假等常用来表示某种假设设条件。如：条件。如：I wouldnt have made such rapid progress without

8、your help.没有你的帮助，我不会取得没有你的帮助，我不会取得这这么快的么快的进进步步.(3)有有时时候从句和主句候从句和主句动动作作发发生的生的时间时间不一不一致，致，这时谓语动词这时谓语动词的形式要根据具体的的形式要根据具体的时间时间来来调调整。如：整。如：If the weather had been more favourable，the crops would be growing still better.如果如果(过过去去)天气好一些，天气好一些，(现现在在)庄稼庄稼还还会会长长得得更好。更好。虚虚拟拟情况情况从句从句谓语谓语主句主句谓语谓语例句例句备备注注与将与将来事来事

9、实实可可能相能相反反过过去去式式/were to do/should dowould/should/could/might doIf I were to do it，I would do it in a different way.要是我做要是我做这这件件事，我会用另事，我会用另一种做法。一种做法。I would certainly go if I had time.要要是有是有时间时间我一我一定去。定去。(1)条件从句中有条件从句中有时时可省略可省略if而采用倒装而采用倒装结结构，将构，将should，were或或had提到主提到主语语之前。如：之前。如：Had it not been fo

10、r your help，we wouldnt have achieved so much.要不是由于你要不是由于你们们的帮助，我的帮助，我们们就不会取得就不会取得这这么大么大的成就。的成就。(2)介介词词(短短语语)without/but for、连词连词but、副、副词词otherwise等常用来表示某种假等常用来表示某种假设设条件。如：条件。如：I wouldnt have made such rapid progress without your help.没有你的帮助，我不会取得没有你的帮助，我不会取得这这么快的么快的进进步。步。(3)有有时时候从句和主句候从句和主句动动作作发发生的生

11、的时间时间不一致，不一致，这这时谓语动词时谓语动词的形式要根据具体的的形式要根据具体的时间时间来来调调整。如：整。如：If the weather had been more favourable，the crops would be growing still better.如果如果(过过去去)天气好一些，天气好一些，(现现在在)庄稼庄稼还还会会长长得更得更好。好。2.虚拟语气在一些固定句型中的用法虚拟语气在一些固定句型中的用法句句型型用法用法例句例句备备注注在在wish后后面面的的宾宾语语从从句句中中从从句句谓谓语语向向前前推推一一个个时态时态I wish I could fly like

12、 a bird.我我希希望望能能像像鸟鸟儿儿一一样样飞飞翔翔。I failed in the exam.I really wish I had known the answers.我我 考考试试没没及及格格。我我真真希希望望当当时时我我知道答案。知道答案。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It is wished that man could fly freely

13、in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生日日时时能能得得到到一一辆辆新新自自行行车车。(2)在在It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词insistence/suggestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这这些名些名词词相相应应的的动词动词后

14、面后面宾语宾语从句的从句的谓语谓语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加20%。His suggestion that you(should)change your job is reasonable.他他建建议议你你换换换换工作是有道理的。工作是有道理的。句型句型用法用法例句例

15、句备备注注在在 insist/suggest(建建议议)/propose/order/demand/require/request等等后后面面的的宾宾语语从句中从句中从从句句谓谓语语 用用(should)do的的 形形式式He suggested that we(should)start at once.他他建建议议我我们们马马上上出出 发发。He ordered that all(should)attend the meeting.他他 命命令令所所有有人人都都参参加加这这次次会会议议。He insisted that I(should)apologize to him.他他坚坚持持要要我向

16、他道歉。我向他道歉。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It is wished that man could fly freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生日日时时能能得得到到一一辆辆

17、新新自自行行车车。(2)在在It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词insistence/suggestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这这些些名名词词相相应应的的动动词词后后面面宾语宾语从句的从句的谓语谓语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their

18、 proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加20%。His suggestion that you(should)change your job is reasonable.他他建建议议你你换换换换工工作是有道理的。作是有道理的。句型句型用法用法例句例句备备注注在在 it is necessary/important/possible/strange/no wonder/a pity/a shame等等后后面面的的主主语语从句中从句中谓谓语语用用(should)do的的形式形式It

19、is necessary that he(should)be sent there at once.有有必必要要马马上上派派他他到到那那里里去去。It is a pity that he(should)be so careless.真真遗遗憾憾他他会会这样这样粗心。粗心。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It is wished that man could fly

20、 freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生日日时时 能能 得得 到到 一一 辆辆 新新 自自 行行 车车。(2)在在 It is suggested/proposedthat引引导导的的主主语语从从句句以以及名及名词词insistence/suggestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这

21、这些些名名词词相相应应的的动词动词后面后面宾语宾语从句的从句的谓语谓语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产 量量 增增 加加 20%。His suggestion that you(should)change your job is reasonable.他他建建议议你你换换换换工作是有道

22、理的。工作是有道理的。句型句型用法用法例句例句备备注注在在It is time that 后后 面面的的 定定语语 从从句中句中谓谓语语用用过过去去式式或或(should)do的的形式形式It is time that we went(should go)to bed.我我们们该该睡睡觉觉了了。Its high time that he settled down and started a new life.他他该该安安顿顿下下来来开开始始新新生生活了。活了。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语

23、从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It is wished that man could fly freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生日日时时能能得得到到一一辆辆新新自自行行车车。(2)在在It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词insistence/sug

24、gestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这这些些名名词词相相应应的的动动词词后后面面宾宾语语从句的从句的谓语谓语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加

25、20%。His suggestion that you(should)change your job is reasonable.他建他建议议你你换换换换工作是有道理的。工作是有道理的。句型句型用法用法例句例句备备注注在在 as if/as though后后面面的的 从从句中句中谓谓语语多多向向前前推推一一个个时时态态She always talks to me as if she were my sister.她她 总总是是以以我我姐姐姐姐的的口口气气跟跟我我说说 话话。He walked slowly as though he had hurt his leg.他他走走得得很很慢慢好好像像

26、腿腿受受伤伤了。了。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It is wished that man could fly freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生日日时时能能得得到到一一辆辆

27、新新自自行行车车。(2)在在It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词 insistence/suggestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这这些些名名词词相相应应的的动动词词后后面面宾宾语语从从句句的的谓语谓语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Thei

28、r proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加20%。His suggestion that you(should)change your job is reasonable.他建他建议议你你换换换换工作是有道理的。工作是有道理的。句型句型用法用法例句例句备备注注在在in order that/so that/for fear that/in case后后面面的的从从句中句中谓谓语语可可用用could/might/should do的的形形式式She took a taxi so t

29、hat she could get there in time.她她坐坐上上出出租租车车，以以便便能能准准时时到到达达那那儿儿。Heres some money in case you should need it.这这儿儿有有点点钱钱，以以防防你你需要需要时时用。用。(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气,谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式.如如：It is wished that man could fly

30、freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过生生 日日 时时 能能 得得 到到 一一 辆辆 新新 自自 行行 车车。(2)在在 It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词insistence/suggestion/proposal/order/demand等等后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同

31、这这些些名名词词相相应应的的动动词词后后面面宾宾语语从从句句的的谓谓语语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加20%。His suggestion that you(should)change your job is reasonable.他建他建议议你你换换换换工作是有道理的。

32、工作是有道理的。句型句型用法用法例句例句备备注注在在if only 引引导导的的感感叹叹句句中中谓谓语语多多向向前前推推一一个个时态时态If only I could see him once！要要 是是我我能能见见他他一一面面就就好好了了！If only I hadnt lost it！要要是是没没丢丢失失它它多多好！好！(1)在在It is wishedthat引引导导的的主主语语从从句句以以及及名名词词wish后后面面的的表表语语从从句句、同同位位语语从从句句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同wish后后面面宾宾语语从从句句的的谓谓语语的的形形式式。如如：It i

33、s wished that man could fly freely in the sky.人人类类希希望望能能在在空空中中自自由由飞飞翔翔。My wish is that I could get a new bike on my birthday.我我的的愿愿望望是是过过 生生 日日 时时 能能 得得 到到 一一 辆辆 新新 自自 行行 车车。(2)在在 It is suggested/proposedthat引引导导的的主主语语从从句句以以及及名名词词insistence/suggestion/proposal/order/demand等等 后后面面的的表表语语从从句句、同同位位语语从从句

34、句中中也也要要用用虚虚拟拟语语气气，谓谓语语的的形形式式同同这这些些名名词词相相应应的的动动词词后后面面宾宾语语从从句句的的谓谓语语的形式。的形式。如如：It was suggested that we(should)hold a meeting tomorrow.人人们们建建议议我我们们明明天天召召开开一一次次会会议议。Their proposal is that their output(should)be increased by 20%.他他们们的的提提议议是是产产量量增增加加20%。His suggestion that you(should)change your job is r

35、easonable.他建他建议议你你换换换换工作是有道理的。工作是有道理的。3.“情情态动词态动词have done”表示虚表示虚拟语拟语气气有有些些情情态态动动词词后后用用完完成成式式也也表表示示与与事事实实相相反反的情况，常用的的情况，常用的见见下表：下表：形式形式意意义义例句例句ought to/should have done本本应该应该做做事事实实上并上并未做未做You should have told me earlier that you werent able to come.你本你本应该应该早点早点儿告儿告诉诉我你不能来我你不能来的。的。形式形式意意义义例句例句could h

36、ave done本可以做事本可以做事实实上并未做上并未做You are late again.You could have come earlier.你又来晚了，你本你又来晚了，你本可以早来一些的。可以早来一些的。形式形式意意义义例句例句may/might have done本可能本可能做事做事实实上并未上并未做做Youve made a few mistakes.You might have been a little bit more careful.你犯了几个你犯了几个错误错误，你本你本应应再再细细心点的。心点的。need not have done本没必本没必要做事要做事实实上做上做了

37、了You neednt have told him.He had already known about it.你当你当时时没必要告没必要告诉诉他，他已他，他已经经知道了。知道了。.完成句子完成句子1.她希望要是昨天晚上去了她希望要是昨天晚上去了剧剧院院该该多好啊。多好啊。She wishes she _ to the theatre last night.2.我姐姐建我姐姐建议议我接受邀我接受邀请请。My sister advised me that I _ the invitation.专项训练专项训练专项训练专项训练had gone(should)accept3.你你考考虑虑王王芳芳提提

38、出出的的她她邀邀请请李李先先生生参参加加聚聚会会的建的建议议了了吗吗？Do you think of Wang Fangs suggestion that she _ the party?4.他表他表现现得好像知道世界上的所有事情。得好像知道世界上的所有事情。He acts as if he _ in the world.(should)invite Mr Li toknew everything5.我我们该们该回家了。回家了。It is high time we _.句型句型转换转换1.You are taller than me.I wish I _ as tall as you.2.He

39、 regrets having said that now.He wished he _ _ that.went home/should go homewerehadntsaid3.I didnt go with him last night.I would rather I _ _ with him last night.4.I stayed late last night.I wish I had not done like that.I _ _ _to bed earlier.5.See what you have done！You pulled the plant out and it

40、 is dead now.had goneshouldhavegoneYou _ _ _ the plant out and it is dead now.6.It was a pity that I didnt take my son along with me to the party.I _ _ _ my son along with me to the party.7.We throw too much waste into the river，and its too late to make it clear as it was.shouldnthavepulledshouldhav

41、etakenWe _ _ _ so much waste into the river，and its too late to make it clear as it was.8.I laughed at her when she told me she fell in love with an ordinary boy.I feel sorry for that now.I _ _ _ _ her when she told me she fell in love with an ordinary boy.shouldnthavethrownshouldnthavelaughedat9.Wh

42、en I went to work yesterday，I took an umbrella with me.But the weather turned out to be fine all day long.I _ _ _ the trouble to carry the umbrella with me when I went to work yesterday.neednthavetaken10.I forgot to tell him about the important news.I felt much regret at that.I _ _ _ him about the i

43、mportant news.haveshouldtold.根根据据提提示示用用所所给给单单词词或或短短语语的的适适当当形形式式填空填空1.Mike insisted that he_(从未从未偷过东偷过东西西)(steal)2.The workers in the factory demanded that their pay _(提提高高20%)(raise)had never stolen anythingbe raised by 20 percent3.It is demanded that the books _(需需归还归还)the school library within two

44、 weeks.(return)4.It is suggested that _(运运动动会推会推迟迟)till next Friday.(put off)5.Were _(下下雨雨)tomorrow，the meeting would be put off.(rain)should be returned tosports meeting(should)be put off it to rain6.I supported him in time，otherwise he _(从从自自行行车车上摔下来上摔下来)(fall)7.Which doctor _(你建你建议议派来派来)immediate

45、ly？(suggest)8.It is high time that we _(采取措施采取措施)to protect the environment.(measure)would have fallen off the bike do you suggest be sent forshould take/took measures写作指导妙笔生花写作指导妙笔生花如何写社会如何写社会热热点点类议论类议论文文基础写作基础写作随随着着“开开心心农农场场”、“QQ农农场场”等等娱娱乐乐游游戏戏风风靡靡互互联联网网，许许多多中中学学生生也也加加入入了了偷偷菜菜的的行行列。列。【写作内容写作内容】请你根

46、据下表的内容，用英语写一篇短文，请你根据下表的内容，用英语写一篇短文，并谈谈你个人的看法。并谈谈你个人的看法。现现象象1.沉迷其中，沉迷其中，乐乐此不疲；此不疲；2.身身在在课课堂，心在堂，心在农场农场；3.作作业业拖拖拉，成拉，成绩绩下降。下降。原因原因1.寻寻找找农农耕的耕的乐乐趣；趣；2.释释放学放学习习的的压压力力;3.拉近朋友的距离拉近朋友的距离.你的看法你的看法(至少两点至少两点)【写作要求写作要求】1只能用只能用5个句子表达全部内容；个句子表达全部内容；2开头已给出，不计入总句数。开头已给出，不计入总句数。【评分标准评分标准】句子结构准确，信息内容完整，篇章连贯。句子结构准确，信

47、息内容完整，篇章连贯。Nowadays，QQ Farm and Happy Farm are very popular among people from all walks of life.A large number of middle school students are also involved in the game._审题谋审题谋篇篇1.这是一篇反映社会热点问题这是一篇反映社会热点问题(现象现象)的论文的论文.这种体裁的书面表达一般可分为三个部分。这种体裁的书面表达一般可分为三个部分。第一部分开门见山提出问题，第二部分分析第一部分开门见山提出问题，第二部分分析问题，第三部分发表

48、个人的看法并提出合理问题，第三部分发表个人的看法并提出合理的解决措施。的解决措施。2.提出问题也就是阐述现象，比如提出问题也就是阐述现象，比如QQ农场农场和开心农场风靡网络，一些中学生沉迷于此和开心农场风靡网络，一些中学生沉迷于此类游戏，以及沉迷于游戏的中学生的表现。类游戏，以及沉迷于游戏的中学生的表现。3.分析问题也就是分析产生此类现象的原因分析问题也就是分析产生此类现象的原因,具具体明确地阐述中学生沉迷于此类游戏的原因。体明确地阐述中学生沉迷于此类游戏的原因。4.发表见解部分也就是阐明自己的观点。观点发表见解部分也就是阐明自己的观点。观点应该科学合理应该科学合理,符合社会的实际符合社会的实

49、际,贴近读者贴近读者.5.议论文用一般现在时态即可。句子当中应使议论文用一般现在时态即可。句子当中应使用一些高级词汇和复杂句式用一些高级词汇和复杂句式.同时句子与句子、同时句子与句子、段落与段落之间要使用恰当的过渡词段落与段落之间要使用恰当的过渡词,从而使文从而使文章结构紧凑，过渡自然。章结构紧凑，过渡自然。写作要点写作要点1.许许多人沉溺于此，以网上多人沉溺于此，以网上偷偷菜菜为乐为乐。Some of them _ and _ stealing vegetables online.Some of them _ and _ stealing vegetables online.are addi

50、cted to ittake great delight inare crazy about itenjoy2.这这浪浪费费太太多多时时间间，以以致致他他们们不不能能及及时时上上交交家庭作家庭作业业，学，学习习成成绩绩急急剧剧下降。下降。It wastes too much time so that _.It wastes too much time so that_they fail to hand in their homework in time and there is a sharp decline in their gradesthey cant hand in their hom