since用法，since与for的用法

1，since与for的用法

for后面加的是段时间since后面是加的点时间比如说，同样一个句子，我来这儿有十年了I have been here for ten years. I have been here since ten years ago. 看出区别了么？for后面加的是“十年”，是段时间 since后面加的是“十年前”意为从“十年前开始”是某一个时间点

for 持续2年 since 从2年前起 since 从星期一起 for 持续3天总的来说 for就是跟持续时间 since跟从什么时候起懂了吧

since与for的用法

2，完成时加since的用法

have 加延续动词pp 加since短语为从since开始动作的延续，而当动词为瞬间动词是则表示从since开始动作对现在的影响这种说法不对。现在完成时通常有两层含义：1.表示过去已发生但对现在情况有影响，常与already，never，up to now，in the last.......years,yet（用于否定句），just before等词作状语时连用。eg He has gone to Beijing.他已经到北京去了。（表示他现在不在这里。） Someone has turned off the light.（说明现在灯不是开着的。）有人把灯关了。2表示过去开始，持续到现在的动作或状态。常与since，for等连用。 eg We have not seen each other for ten years.我们十年没见面了。（没见面的动作从十年前持续到现在。）它常和“for+一段时间”或“since+某个时间点”连用。持续性动词可用表示一段时间的状语修饰，而瞬间动词则不可。lose是瞬间动词，不能与表示一段时间的状语连用，如for。可以说I have lost my book since one year ago.\My book has been lost for one year.

完成时加since的用法

3，关于 SINCE 的全部用法

since的用法：译作“自从…以来” (1)接时间点：如 I have stayed in that country since 1995. 要求：谓v.用现在完成时，而且须是延续性动词。 (2)接一段时间 + ago：如 They have lived in that house since two years ago. 要求：谓v.用现在完成时，而且须是延续性动词。 (3)接时间状语从句：如 I have loved her since I met her last time. / Lily has stayed at home since she left school. 要求：主句的谓v.用现在完成时，而且须是延续性动词；从句的谓v.用一般过去时，而且须是终止性动词。 (4)用于句型“Its / It has been + 一段时间 + since + 时间状语从句”中，译作“自从…以来, 已经…(时间)了”。如 Its / has been three months since he moved to this city. 要求：主句的谓v.用一般现在时或现在完成时；从句的谓v.用一般过去时，而且须是终止性动词。 (5)用于句型“一段时间 + has passed since + 时间状语从句”中，译作“自从…以来, …(时间)已经过去了”。如上个例句还可写成：Three months has passed since he moved to this city. 要求：主句的谓v.用现在完成时，而且动词必须是has passed；从句的谓v.用一般过去时，而且须是终止性动词。 (6)注：当since用于否定句时，主句的谓v.可以是终止性动词。如 He hasnt seen the film since last month. (7)相关词组：“从那时起”：ever since、since then、from then on. 注：ever since作为一个词组，放句尾可单独使用。如I have given up smoking ever since. 另外，还可在since后接句子。since前加ever，只是加重语气而已。如 I have given up smoking ever since I caught a bad cough. (8) since还可引导原因状语从句，译作“由于；因为”，相当于because。如 Since he was lazy, he didnt finish his homework.

关于 SINCE 的全部用法

4，英语since的用法

since+一段时间用现在完成时 since+过去的一段时间用过去完成时总之，把时态都往前推一格就可以了

It is/was ……since ……是固定搭配，表示……已经有几年了，用is时后面一般是过去时，用was时后面一般是过去完成时，因为需要强调since后动作在前，即过去的过去

since 后跟时间点

since后面的句子表示过去的过去，所以用过去完成时，即had enjoyed

since的用法主要有两点：一是表示“自从……以来”，二是表示“既然”之意。但如果只了解词的含义，而不了解其用法，在使用时就会造成错误。例如：I have not heard from him since I lived in Shanghai. 不少人会望文生义，将该句译为：“自从我住在上海以来，就再也没有收到他的信了。”而实际上这个句子的译文并非如此，那么正确的含义是什么呢？下面谈谈since作连词引导时间状语从句的用法。一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如： He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。 We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。这是最常见的一种用法，此处不再多述。二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如： I havent heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。 John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约，他不当教师已经三年了。本文开始出现的那个句子就可以译为“自从我离开上海，就再也没有收到他的信。”这种译法常被人们误用，我们不妨再多举几个例子看看： How long is it since you lived in Shanghai?你离开（没住在）上海多久了？ It is half a month since he was a League member.他退团（不当团员）半个月了。 Its been quite some time since I was last in London我离开伦敦已很长时间了。比较：He has written to me frequently since I was ill.自从我病愈以来，他屡次给我写信。（从句谓语为状态动词） He has written to me frequently since I fell ill.自从我生病以来，他就屡次给我写信。（从句谓语为终止性动词）三、若since引导的状语从句的谓语为持续性动词的现在完成时，则表示动作和状态延续到现在（说话时刻），其表示的时间的起点应从动作发生之时算起。如： I havent heard from him since he has lived there。这里has lived表示动作的持续性，时间的起点应从：“开始居住”时算起。因此此句可理解为“自从他（开始）住在那儿起，我就一直没收到他的来信”。 Since we have owned a car, we have gone camping every year。自从我们自己有了汽车，我们每年都去野营。试比较：1. Since Ive been at this school, we have had three headmasters.自从我到这所学校，我们已换了三个校长了。 Since I was at this school, they have had three headmasters.自从我离开这所学校，他们已换了三个校长了。 2.He has never been to see me since I have been ill. 自从我生病以来，他从未来看过我。 He has never been to see me since I was ill. 自从我病愈以来，他从未来看过我。由此可见，since引导的从句持续动词的一般过去时和现在完成时所表示的意思恰好相反。换言之，前者以肯定的语法形式反映着否定的逻辑内容，而后者的形式与内容是一致的。至于It is +一段时间+since…的句型与It has been +一段时间+since…意思相同。前者是规范说法，后者是口语说法。应注意的是，在这种结构中，since引导的从句绝对不能用否定式的谓语动词来表示否定意义，下面两句都错了： It is a long time since he didnt study English. Its two months since you didnt come to see me. 正确的说法为： Its a long time since he studied English 他好久没学英语了。 You havent come to see me for two months. 你有两个月没来看我了。