知识点1:for；since
[1]since单词记忆法◆记忆方法一：联想方式：sin四年；ce车自从来广州，他就开了四年车◆记忆方法二：联想方式：sin四年；ce车记忆方法：自从来广州，他就开了四年车
for与since都能与现在完成时连用，但区别较大：
[2]现在完成时,区别,相关知识点知识点1:现在完成时和现在完成进行时的区别Mr. Smith has lived in London since 1979.（b）(a)句有“史密斯先生在伦敦久居”的含义，(b)句则没有。（3）但现在完成进行时并不总是具有临时的性质，如：My mother has been teaching English for twenty years. (a)[
for后须接“时间段”，since后须接“时间点”，二者可以转换，均须与延续性动词连用，也可以与非延续性动词的否定式连用。二者引出的时间状语往往用 how long提问。如：
[3]非延续性动词,延续性动词,相关知识点知识点1:延续性动词和非延续性动词He has just arrived. 他刚刚到达。上面两句的谓语都用了现在完成时，但第一句中的动词live是延续性动词，而第二句中的动词arrive为非延续性动词。两者真正不同的是，延续动词根据需要可以连用一段时间，而非延续性动词通常不能连用一段时间，所以第一句中的live可以连用一段时间for ten years，第二句中的arrive则
He has been here for two years．＝He has been here since two years ago．他来这里已有两年了。
—How long have you had this book？这本书你买多久了？
—For a week．／Since a week ago．买一周了。
We haven't heard from him for a month．我们已有一个月没收到他的来信了。
since能引导时间状语从句（主句用现在完成时，从句用一般过去时），而for则不能。如：
[4]现在完成时,一般过去时,相关知识点知识点1:现在完成时转换成一般过去时现在完成时可以转化成一般过去时，还可以转化成“It is/has been +时间段+since从句(用一般过去时)”等句型。e.g. Jim has been back for a month. 吉姆已经回来一个月了。 = Jim came back a month ago. 吉姆一个月前就回来了[1]back,ca
He has taught here since he came to China．自从他来到中国就在这儿教书。 It is ／has been an hour since he left here．他离开这儿已有一小时了。
知识点2:比较since和for
注意：并非有for 作为时间状语的句子都用现在完成时。
I worked here for more than twenty years.
[5]more,than,相关知识点much more…than和many more…than的用法区别[1]区别,用法,相关知识点知识点1:every和each的用法区别[1]every单词记忆法◆记忆方法一：联想方式：eve（前夕）+ry（容易）每个圣诞节前夕孩子们都容易兴奋不已。◆记忆方法二：联想方式：eve（前夕）+ry（容易）记忆方法：每个圣诞节前夕孩子们都容易兴奋不已。查看详情>>两者都有&ldquo
(我现在已不在这里工作。)
I have worked here for many years.
(现在我仍在这里工作。)
小窍门： 当现在完成时+一段时间，这一结构中，我们用下面的公式转化，很容易就能排除非延续动词在完成时中的误使。
[6]现在完成时,动词,相关知识点知识点1:延续性与非延续性动词在现在完成时态中的使用Jim has been a member of the band for a month. 吉姆已经加入那个乐队一个月了。His grandfather has died. 他祖父已经死了。His grandfather has been dead for 2 years. 他祖父已经死了两年了。My father has
1) (对) Tom has studied Russian for three years.
[7]Russian单词记忆法◆记忆方法一：联想方式：Rus（如实） ； si四；a（苹果）到俄罗斯请如实交出四个苹果。◆记忆方法二：联想方式：Rus（如实） ； si四；a（苹果）记忆方法：到俄罗斯请如实交出四个苹果。
since相关单词意思与记忆法：
since单词意思解释释义：
prep. 自...以后, 自...以来ad. 自那时以后conj. 既然, 自...以后, 自...以来相关词组: long since ever since
since单词记忆法：
◆记忆方法一：
联想方式：sin四年；ce车
自从来广州，他就开了四年车
◆记忆方法二：
联想方式：sin四年；ce车
记忆方法：自从来广州，他就开了四年车
for相关单词意思与记忆法：
for单词意思解释释义：
prep. 为, 因为, 至于conj. 因为【计】 DOS批处理命令:对一组参数重复执行指定的命令相关词组: If it weren't for... for all for all that for life for oneself
for单词记忆法：
◆记忆方法一：
联想方式：fo：佛；r小草
为佛献小草
◆记忆方法二：
联想方式：fo：佛；r小草
记忆方法：为佛献小草
since单词相关例句：
I have long since abandoned the notion that higher education is essential to either success or happiness. Hot houses of learning do not always grow anything edible.Robert Moses, American state govenment officer——我早已抛弃了这种观念：高等教育是通往成功或者幸福的必由之路。知识的“温室”并不总能生长可供食物用的粮食。美国州政府官员 摩西 R
The laws of Nature, that is to say the laws of God, plainly made every human being a law unto himself, we must steadfastly refuse to obey those laws, and we must as steadfastly stand by the conventions which ignore them , since the statutes furnish us peace, fairly good government and stability, and therefore are better for us than the laws of God, which would soon plunge us into confusion and disorder and anarchy if we should adopt them.Mark Twain, American writer自然法即神灵法，只是用来约束每一个个体的法律，我们必须坚定地拒绝遵守。我们应该坚定地遵守忽视神灵法的规章制度，因为规章制度赋予我们和平、比较好的政府和稳定，因而对我们来说，规章制度比神灵法更好，因为如果我们采用神灵法的话，他会将我们陷入迷惑、无序和无政府状态。美国作家 马克·吐温A
Be not angry that you cannot make others as you wish them to be, since you cannot make yourself as you wish to be.Thomas Mann, German writer——不要由于别人不能成为你所希望的人而愤怒，因为你自己也不能成为自己所希望的人。德国作家 托马斯·曼
The United States is a republic, since its citizens elect people to represent it.
美国是共和制，因为每个公民都能选人去代表他们。
I'm lame since my accident; I need the help of my arms to walk.
事故之后我就瘸了，我需要手来帮助我走路。
Primitive men made fire by themselves since they had no electricity.
原始人不能用电，只能自己生火。
Ever since she started her diet, she has had a very slim figure.
她的身材自从节食开始就很苗条了。
Great changes have taken place in China since the introduction of the reform and opening policy .
改革开放以来，中国发生了巨大的变化。
They greet each other out of manners, since they are just acquaintances.
他们招呼对方是出于礼貌，因为他们只是泛泛之交。
I like the white sheet since it looks clean.
我喜欢这个白床单，因为它看起来很干净。
for单词相关例句：
Destiny: A tyrant's authority for crime, and a fool's excuse for failure.——Ambrose Bierce, American writer 命运：暴君施虐的权利，傻瓜失败的借口。美国作家 比尔斯.A.
Destiny: A tyrant's authority for crime, and a fool's excuse for failure. ( A. Bierce )—— 命运是暴君施虐的权威，傻瓜失败的借口。（比尔斯）
There is no cure for birth and death save to enjoy the interval. 生和死都无法治,只有享受两者之间的间隔.
It is better to fight for good than to rail at the ill. 与其抱怨，不如积善。
It is better to fight for justice than to rail at the ill.——Alfreds Tennyson, Bitish writer与其责骂罪恶，不如伸张正义。英国作家 丁尼生
I want to bring out the secrets of nature and apply them for the happiness of man . I don't know of any better service to offer for the short time we are in the world .(Thomas Edison , American inventor) 我想揭示大自然的秘密，用来造福人类。我认为，在我们的短暂一生中，最好的贡献莫过于此了。 (美国发明家 爱迪生. T.)
Do not , for one repulse , give up the purpose that you resolved to effect .(William Shakespeare , British dramatist) 不要只因一次失败，就放弃你原来决心想达到的目的。(英国剧作家 莎士比亚.W.)
Do not, for one repulse, forgo the purpose that you resolved to effort. ( Shakespeare )—— 不要只因一次挫败，就放弃你原来决心想达到的目的。（莎士比亚）
All my possessions are for a moment of time. Elizabeth I. Queen of England 我的一切都是为了那辉煌的一刻。英国女王 伊丽莎白一世
A state which dwarfs its men ,in order that they may be more docile instruments in its hands even for beneficial purposes will find that with small men no great thing can really be accomplished.——John Stuart Mill, British economist 一个政府压制它的人民，以使他们成为自己手中的驯服工具——即便是为了正当的目的——它也会发现，靠受压制的人是不可能真正成就什么大事的。英国经济学家 穆勒J.S.
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