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我们再怎么强调保护眼睛的重要性也不为过。 45、before 句型：
(1) before sb can/ could ? 某人还没来得及??
例：Before I could get in a word ，he had measured me． 我还没来得及插话，他就给我量好了尺寸 (2) It will be +时间+ before + 还有多长时间??
例：It will be 4 years before he graduates. 他还有四年时间变毕业了。 (3) had done some time before （才??）
例：We had sailed four days and four nights before we saw land. 我们航行了四天四夜才见到陆地。
(4) had not done --- before --- 不到??就?? 例：We hadn’t run a mile before he felt tired. 我们还没走到一英里路就觉得累了。
(5) It was not +一段时间+ before 不多久就?? 例：It wasn’t two years before he left the country. 还没到两年他们离开了那国家。
46、用于表示过去未实现的希望和计划的句型：
(1) should like to/ would like to/ would love to have done sth. 例：You should like to have written to your mother. 你本应当给你母亲写信。
(2) was / were going to do sth.（用过去将来时态表示原打算做什么） 例：Lucy was going to watch a basketball match. Lucy 原打算看一场篮球比赛。
(3) was / were going to have done sth. 表示未完成原来的计划和安排 例：Lily was going to have cleaned her bedroom, but she had no time. Lily 原打算清理她的卧室，但她没时间。
(4) expect, intend, hope, mean, plan, promise, suppose, think, want, wish ．．．
常用过去完成时态,在这些词后接宾语从句或者接不定式的一般形式； 或者用一般过去时态后面接不定式的完成形式表示过去未曾实现的愿望 例：She had supposed him to be very rich. 她原以为他很有钱。 (5) wish that ?had done sth.表示过去未曾实现的愿望．
例：I wish he had been here yesterday. 要是他昨天在这儿就好了。
(6) 情态动词should ,would, could, might, ought to等后接不定式的完成时， 表示过去本该做，打算做，想做而未做的事情．
should have done =ought to have done 本应该做而没做 would have done = 本来就会去做某事而没做 could have done = 本可以做某事而没做 might have done 本可以做而没做
例：They ought to have apologized. 他们本该道歉的。 47、倍数句型：
(1)倍数＋比较级＋than．．．，
例：The room is twice larger than that one．这个房间是那个房间的两倍大。
There is 30 times greater chance of being hit by lightening than being attacked by a shark. (2)倍数＋as＋原级＋as．．．，
例：The room is three times as large as that one． 这个房间是那个房间的三倍。
(3)倍数＋the size ／height／length ／weight ／width of．．．
例：The room is three times the size of that one． 这个房间是那个房间的3倍大。
48、比较句型： (1)原级比较：
例：English is not so difficult a subject as Russia. 英语不是和像俄语一样难的科目。
Their bones are not as thick as adults’. 他们的骨头和成年人的不一样厚。 (2)一方超过另一方：
例：The weather of this year is a lot hotter than that of last year. 今年的气候比上一年的气候要热得多。 (3)一方不如另一方：
例：The restoration was so bad that it made some of the buildings less secure than they had been before.
修复工作是如此的糟，以致于它使得一些建筑没有以前安全了。 (4) The + ~er + S + V, ~~~ the + ~er + S + V ~~~
The + more + adj + S + V, ~~~ the + more + adj + S + V ~~~ （愈...愈...）
例：The harder you work, the more progress you make. 你愈努力，你愈进步。
The more books we read, the more learned we become. 我们书读愈多，我们愈有学问。 (5) more?. than?与其说?倒不如说
例：Smith is more diligent than intelligent. 与其说Smith聪明倒不如说他勤奋。
(6) no +形容词比较级+ than = as +形容词的反义词+ as
例：I am no better at English than you. 我的英语不比你好。 (7) that 在前后比较中代替不可数名词和特指的单数可数名词
例：The traditional picture of St Nicholas is quite different from that of Father Christmas.
(8) one 在前后比较中代替泛指的单数可数名词。
例：I prefer a flat in Beijing to one in Nanjing, because I want to live near
my Mom's. 与南京相比我更喜欢在北京有一套公寓，因为我想跟我妈妈住一起。 (9) those 在前后比较中代替 特指的复数可数名词。 例：Salaries are higher here than those in my country. 这儿的工资比我们国家的高。
(10) ones 在前后比较中代替泛指的复数可数名词
例：Cars do cause us some health problems --- in fact far more serious ones
than mobile phones do.汽车确实给我们的身体健康带来问题，事实上比手机造成的问题更严重。 49、感叹句型：
(1) What a + adj + N + S + V!
例：What an important thing it is to keep our promise! 信守我们的诺言是多么的重要啊！ (2) How + adj + a + N + V!（多么...！）
例：How important a thing it is to keep our promise! 遵守诺言是多么重要的事！ (3) How + S + V!
例句：How I want to go to Beijing. 我多么想去北京啊！ 50、表法猜测的句型：
(1) must have done sth 一定做过某事 否定形式：can't have done 例：She must have come here last night. 她一定是昨晚来的。 She can't have gone there 她不可能到那儿去。
(2) may have done sth 可能做过某事 否定形式：may not have done 例：Philip may have been hurt seriously in the car accident. Philip 可能在这次车祸中伤得很严重。
(3) might have done sth 或许做过某事 否定形式: might not have done 例：She might have known what the bottle contained. 她或许知道这个瓶子里装的是什么。 (4) should have done sth 估计已经做了某事 否定形式：should not have done
例：She should have arrived in her office by now. 她此刻估计已经到达办公室了。 51、动词不定式常用句型：
(1) It takes / took / will take sb. some time / money to do sth. 某人花/花了/将花多长时间/多少钱做某事.
例句：It took me years of hard work to speak good English. 为了讲一口流利的英语,我花了多年时间刻苦操练. (2) It is + adj +for/of sb to do sth
例：Lincoln said that it was not right for the South to break away from the Union. 林肯说南方脱离联邦是不对的。 It was careless of Tom to break the cup.
(3) Sb. have / has / had no choice but to do... 某人除了做??别无选择. 例句：We had no choice but to take a taxi for we'd missed the last bus. 由于错过了最后一班公共汽车,除了乘坐的士,我们别无选择. (4) It's not /just like sb. to do sth.??的行为不/正像某人的一贯作风. 例：lt's not like Jim to be late for class. He regards time as the most important thing in life.
上课迟到不像吉姆的一贯作风,他把时间看作是生命中最重要的. (5) ．．．．形容词／副词＋enough to do sth．
例：I was fortunate enough to travel to South Africa.． (6) It pays to + V ~~~ （...是值得的。）
例句：It pays to help others. 帮助别人是值得的。 (7) It cost sb some time/money to do sth
例：It must cost a good deal to live here.住这儿一定会花很多钱的。 (8) do all he could to do sth do what he could to do sth
do everything he could to do sth
例：They were doing everything they could to help the fatherland. 他们在尽最大努力去帮助祖国。
(9) It is hard to imagine/ say ? 很难想象/说??
例：It is hard to imagine how Edison managed to work twenty hours each day. 很难想象爱迪生每天是怎样工作20小时的。 It's hard to say whether the plan is practical. 这个计划是否实际很难说。 52、动名词常用句型：
(1) ...have trouble/difficulty/a hard time/a difficult time (in) doing sth. (有困难做某事)
例：People from the two countries do not have any difficulty in understanding each other.
来自那两个国家的人们在相互理解上是没有困难的。 (2) upon/on doing sth, 一??就??
例：Upon / On hearing the unexpected news, he was so surprised that he couldn't say a word.
一听到这个出乎意料的消息，他惊讶到说不出话来。 (3) There is no/some difficulty/trouble (in) doing sth.
例：There is no difficulty in solving this social problem. 解决这个社会问题毫无困难。
(4) There is no need/use harm/hurry in doing sth
例：There is no need in sending such expensive present. 没有必要送这样贵重的礼物。 (5) spend some time/money (in) doing sth
例：They say children spend too much time chatting and playing games instead of focusing on their school work.
他们说孩子们花太多的时间在闲聊和玩游戏上，而不是集中在学习上。 (6) It's no use / good/ worth doing sth
例：It’s no use talking with him. He won’t listen to you. 跟他谈没用，他不会听你的。 (7) It's a waste of time/money/energy doing
例：It's a waste of time watching TV programme as this.
53、Not --- until 句型
(1) 陈述句 not --- until --- 直到??才
例：Last night I didn't go to bed until 11 o'clock. 昨晚我11点钟才睡觉。 (2) 强调句 It wasn't until?that... 直到??才??. 例：It wasn't until yesterday that I got your letter. 我直到昨天才收到你的来信.
(3) 倒装句 Not until...did... 直到??才??.
例：Not until I began to work did I realize how much time I had wasted. 直到我开始工作,我才意识到我已蹉跎了很多岁月. 54、since 句型：
(1) Since + S + 过去式，S + 现在完成式
例句：Since he went to senior high school, he has worked very hard.
自从他上高中，他一直很用功。
(2) It is + --- + since S +持续性谓语动词（表否定）
例：It is three years since she lived here. 她已三年不住这儿了。 (3) It is + --- + since S + 瞬间谓语动词（表肯定）
例：It is years since I stopped smoking）．我戒烟已经数年了。 55、让步状语从句：
(1) Adj./n./adv. + as/ though+ Subject（主词）+ be, S + V~~~ （虽然...） 例句：Rich as our country is, the qualities of our living are by no means satisfactory.
虽然我们的国家富有，我们的生活品质绝对令人不满意。 (2) No matter what等特殊疑问词... ?无论什么??.
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