人教版英语选修八 Unit 5　Meeting your ancestors 知识点课件38张

课件38张PPT。
Book 8　Unit 5　Meeting your ancestors
1.alternative adj.可替代的 n.可供选择的事物
教材原句
①Can you think of the 　alternatives???? we would use today?你能想出我们今天使用的可供选择的物品吗?◆单句改错
②There is no alternative for us but take immediate action to stop pollution.　在but后加to????◆一句多译
为了取得更大的进步,我们不得不充分利用好业余时间。
In order to make greater progress, we
?◆完成句子
恐龙的灭绝不一定是由于天体的碰撞,但也难以找到别的解释。 (2017江苏)
⑥The disappearance of dinosaurs is not necessarily caused by astronomi-
cal incidents. But 　alternative explanations are hard to find????.点拨
(1)have no alternative but to do sth.别无选择只好做某事
there's no alternative别无选择
an alternative to sth.某物的替代品
an alternative method of doing sth.做某事的其他方法
(2)alternatively adv.可供选择地
[联想]
“别无选择只好做……”的其他表达:have no choice but to do sth.;can't do sth. but do sth.;can do nothing but do sth.。2.interrupt vt.& vi.打断……讲话;打岔;暂时中断或中止
教材原句
① I'm sorry 　to interrupt????(interrupt) you but how could they live here?
◆单句填空
②　Interruptions???? (interrupt) are one of the worst things to deal with while you're trying to get work done. (2017课标全国Ⅱ)
③When 　interrupted????(interrupt) by a boy, the speaker was a bit angry.◆写作微练
④不要打断他们。他们正在谈论环保。
　Don't interrupt them. They are talking about the environmental protection.???
⑤不要打扰你的弟弟,他正在学习英语。
　Don't disturb your brother. He is learning English.????点拨
(1)interrupt sb./sth.(with sth.)(因某事)打断某人/某事
(2)interruption n.打扰;插嘴;打岔;阻断物
without interruption连续地;不断地
[助记]
? 3.assume vt.假定;设想
教材原句
①So we think it is reasonable 　to assume????(assume) they lived in these caves, regardless of the cold.◆单句填空
②We are working 　on???? the assumption that everyone invited will turn up.
③　Assuming????(assume)that the advice is accepted, when are we going
to get the money?
④We are working on the 　assumption????(assume)that it was a gas explosion.◆写作微练
一般认为,网上投票非常方便。(2016江苏书面表达)
⑤　It's generally assumed that voting on the Internet is very convenient.点拨
(1)assume sb./sth. to be...假定/假设某人/某事为……
It is assumed that...人们认为……
(2)assumption n.假定;假设
make an assumption认为;假定
on the assumption that...假定……
(3)assuming (that)...假设/假定……(引导条件状语从句)4.significance n.意义;意思;重要性;重要意义
教材原句
①His university was aware of the　significance????(significant) of his work.◆单句填空
②With time going by, I attach great significance to 　reviewing???? (re-view) what I have learned.
③Less tiring than painting your walls and less expensive than buying a
colorful sofa, small color choices bring with them the 　significant????(sig-nificance) benefit of being easily changeable.(2018课标全国Ⅰ)◆句式升级
④Forming good habits is very important for a person's growth as well as success.
→Forming good habits　is of great significance???? for a person's growth as
well as success.◆写作微练
我坚信我们越多地了解这个名言的意义,我们在日常学习和工作中就会获益越多。
⑤I firmly believe that the more 　we are aware of the significance of this famous saying????, the more benefits we will get in our daily study and work.点拨
(1)be of significance to...对……有重要意义
attach significance to...认为……重要
(2)significant adj.重要的;明显的
It is significant that很明显……(从句用should do结构)
[联想]
常用“be+of+抽象名词”的短语:
①be of use=be useful
②be of help=be helpful③be of value=be valuable
④be of significance=be significant
⑤be of importance=be important1.regardless of 不管;不顾
教材原句
①So we think it is reasonable to assume they lived in these caves, regard-less 　of???? the cold.◆完成句子
②The club welcomes all new members　regardless of age????.
俱乐部对所有新成员不分年龄一律欢迎。
③　In spite of/Despite his old age????, he still leads an active life.
尽管年事已高,他依旧过着一种忙碌的生活。◆句型转换
④No matter how old you are, you can sign up for the match.
→You can sign up for the match 　regardless of age????.
⑤Although there are difficulties, we will arrive at the destination on schedule.
→　Despite difficulties????,we will arrive at the destination on schedule.◆写作微练
⑥尽管你反对,我也要继续实施这项计划。
　Despite your objection, I will continue to carry out the plan.????点拨
(1)regardless of“不管,不顾”,表示某事不重要,从而不加以重视或考虑,其后可接whether, what引导的从句。
(2)despite/in spite of意为“尽管……”,其后一般不接从句,但可以接the fact that...。
2.date back to 追溯到……;起始于……
教材原句
①All the objects are from the same excavation site in Sanxingdui and can be dated back 　to???? between 3,000 and 5,000 years ago.◆单句改错
②My interest in stamp collecting dates back my schooldays.　back后加to????
③According to the expert, the temple has a history date from the early Tang
Dynasty.　date→dating????◆完成句子
④They 　have set a date for????their wedding. 他们已经确定了婚礼的日期。
◆写作微练
⑤我不想买这件外套,它的款式过时了。
　I don't want to buy this coat. Its style is out of date.????点拨
(1)date back to(=date from)常用于一般现在时,不用于被动语态。常用其现在分词形式作后置定语。
(2)set a date for确定……的日期
up to date新式的,现代的
out of date过时的,过期的1.If only...要是……就好了
教材原句
①If only it 　could???? be just like last year!◆单句填空
②I paid 200 yuan for speeding. If only I 　had respected???? (respect) the traffic rules.
③It sounds like something is wrong with the car's engine. If 　so????, we'd better take it to the garage immediately.
④Get up early tomorrow morning. If 　　not????, you will miss the first bus.
⑤—The old store enjoys a good reputation in this area.
—I can't agree more. There are very few, if 　　any????, complains about their service.◆写作微练
⑥只有每个人关注我们的环境,我们的地球才不会被污染得那么严重。
　Only if everyone cares about our environment can our earth not be pol-
luted so much.????
⑦要是我不参加会议就好了。(2016课标全国Ⅱ)
　If only I would not attend the meeting.????◆单句改错
⑧I am going to visit some homes for the old in our city, if possibly, in the coming summer holiday.　possibly→possible????点拨
If only+句子,句子使用虚拟语气:
①“If only+一般过去时的句子”表示对现在的虚拟,be动词用were
②“If only+主语+would+动词原形”表示对将来的虚拟
③“If only+过去完成时的句子”表示对过去的虚拟
[点津]
only if“只要……”,引导条件状语从句,位于句首时主句用部分倒装。[联想]
if possible如果可能的话　　　 if necessary如果必要的话
if so如果是这样的话　　 if not如果不
if any如果还有(某物)的话
if ever如果(某事)曾发生过的话2.only to do作结果状语
教材原句
①Abruptly she sat down, only to 　be scooped????(scoop) up by her laugh-ing, shouting sister, Luna.她突然坐了下来,结果被爱吵闹的妹妹露娜一把抱了起来。◆单句填空
②After school we went to the reading room to do some reading, only 　to be told????(tell) that it was being decorated.
③Water can absorb and give off a lot of heat without big changes in tem-perature, thus 　creating????(create) a stable environment.◆一句多译
他年龄太小了,不能一个人去上海。
④　He is too young to go to Shanghai alone.???(too...to...)
⑤　He is not old enough to go to Shanghai alone.???(...enough to do)点拨
(1)only to do...意为“不料(却)……,结果(却)……”,表示一个没有料到
的结果。
(2)现在分词作结果状语常常表示一个意料之中的结果。
[联想]
动词不定式作结果状语的特殊用法:
too...to...太……而不能……
...enough to do够……去……