用作连词(conj.)

He must have taken the book since it isn't here.他一定是把书拿走了,因为书已不在这里了。

Since you can't answer the question, perhaps we'd better ask someone else.既然你无法回答这个问题，我们最好再问问别人。

He had spoken to her only once since the party.自从那次聚会以来,他只跟她说过一次话。

用作介词(prep.)

She's so easily fatigued since her illness.自从病后，她很容易疲劳。

She hasn't been out riding since the accident.她自从出了事故以后，一直没有骑马外出过。

用作副词(adv.)

Bows and arrows have long since been out of use.弓箭很早以前就没人使用了。

He left home two weeks ago and we haven't heard from him since.他两星期以前离开了家，到现在我们一直没有他的消息。

用作介词(prep.)

I have pved here since January.
自一月份以来,我一直住在这里。

He had seen her only once since the meeting.
自从那次会议以来,他只见过她一次。

He's been working in a bank since leaving school.
自从毕业后,他就一直在一家银行工作。

I have not seen him since then.
从那以后我再也没见过他。

用作副词(adv.)

He disappeared many years since.
他多年以前就不知去向。

Her husband died 10 years ago but she has since remarried.
她丈夫于十年前去世,但她后来又嫁人了。

I've long since forgotten what our quarrel was about.
我早就忘掉我们为什么吵架了。

It was not long since that I returned.
我是在不久前回来的。

He came to London 3 years ago and has pved here ever since.
他三年前来到伦敦,此后就一直住在这里。

用作连词(conj.)

Since I left college,I have not seen him.
自从我从大学毕业以后,就没有见过他了。

They have never been to see me since I was ill.
自从我生病之后,他们一直没来看过我。

Since I have owned a bicycle,I have gone to school by it every day.
自从我有了一辆自行车后,我每天骑车上学。

I have known him ever since I was a child.
我自孩提时代起就已经认识他了。

It is ten years since she left me.
自从她离开我已经十年了。

It is five years since he left here.
他离开这儿已有五年了。

It is three years since I have seen him.
我已经三年没见到他了。

It was four months since we had been here.
我们已经有四个月没来这了。

His health is much improved since he gave up smoking.
他自戒烟以来,健康状况大大改善。

I met him last week.Since we left school, we had often written to each other.
上周我遇见了他。自从我们离开学校后,我们曾经常互相写信。

The man has been drinking beer ever since the party started.
宴会开始以来,那个男人就一个劲儿地喝着啤酒。

She has been collecting stamps since she was a child.
她从小起就一直在集邮。

Since it is late,I shall go home now.
由于时间晚了,我现在要回家了。

Since you are so sure of it, he'll bepeve you.
既然你对此这么有把握,他会相信你的。

prep.(介词)

since用作介词的意思是“从…以来,自从…之后”,其宾语常指过去的一个时间点,其含意通常指持续到说话时刻的动作或情况开始于什么时候。

since之后常接名词、动名词作其宾语, since then意为“从那以后”。

adv.(副词)

since用作副词表示“以前”时还可和long, ever连用。long since意为“好久以前”, not long since意为“就在不久前”, ever since意为“从那时起,此后一直”。

conj.(连词)

since用作连词作“自从…以来〔以后或,现在〕”解时,引导时间状语从句,在主句是现在完成时的情况下,如果since从句中谓语动词用一般过去时,则表示动作或状态的完成,计时的起点是动作或状态完成的那一时刻,在语意上,非延续性动词的句子与其词意一致,含有肯定的意味,而延续性动词的句子与其词意恰好相反,含有否定的意味; 如果since从句用延续性动词的现在完成时,则表示该动作或状态一直延续到现在时刻,而且可以包括现在时刻在内,时间的起点应从动作发生之时算起,句子的意思和动词的词意一致,具有肯定意味; 在现代英语中,延续性动词的一般过去时有时也可表示动作或状态延续到现在时刻,时间的起点从动作或状态发生之时算起,不过这类句子多半要用ever来加强since的语意,然而, since从句中的谓语动词如果是非延续性动词,即使用ever来加强语意,也绝不意味着从句动作有什么延续性。

在“it is+since从句”结构中:since从句的谓语动词多用一般过去时,其时间起点的计算以及从句的含意和动词词意的关系与1.中所述的相应部分相同; since从句中的谓词动词也可以用现在完成时,表示动作或状态的完成,时间的起点从动作或状态的完成之时算起,句子与动词的词意相反,含有否定的意味; 在这种结构中,如把is改成was,可用来表示某一过去动作或状态结束时起到另一过去时刻为止的这一段过去时间。

since引导时间状语从句时,若主句表示目前的状况是由于过去某一件事所造成的后果或影响时,其谓语动词也可以用一般现在时; 有时候,通过上下文,可以看出从句的动作是延续到过去某个时间,这时主句的谓语动词要用过去完成时; 如果主句的动作是从过去某时一直延续到现在,主句可用现在完成进行时。

since作“因为,既然,由于”解时,引导原因状语从句,用来说明产生主句的原因,这种原因带有分析后的推理性质。

prep.(介词)［误］ It is now sixty-two years since World War Ⅱ.第二次世界大战距今已有62年了。

正 It is now fifty-six years since World War Ⅱ.

第二次世界大战距今已有56年了。

析 since的宾语有时也可指过去的一段时间,此时since引导的介词短语所表示的时间通常是从这个时期的结束点算起,而第二次世界大战是1939年开始,1945年结束,以2001年计算,因此应是56年,而不是62年。

用作连词(conj.)

He must have taken the book since it isn't here.他一定是把书拿走了,因为书已不在这里了。

Since you can't answer the question, perhaps we'd better ask someone else.既然你无法回答这个问题，我们最好再问问别人。

He had spoken to her only once since the party.自从那次聚会以来,他只跟她说过一次话。

用作介词(prep.)

She's so easily fatigued since her illness.自从病后，她很容易疲劳。

She hasn't been out riding since the accident.她自从出了事故以后，一直没有骑马外出过。

用作副词(adv.)

Bows and arrows have long since been out of use.弓箭很早以前就没人使用了。

He left home two weeks ago and we haven't heard from him since.他两星期以前离开了家，到现在我们一直没有他的消息。

用作介词(prep.)

I have pved here since January.
自一月份以来,我一直住在这里。

He had seen her only once since the meeting.
自从那次会议以来,他只见过她一次。

He's been working in a bank since leaving school.
自从毕业后,他就一直在一家银行工作。

I have not seen him since then.
从那以后我再也没见过他。

用作副词(adv.)

He disappeared many years since.
他多年以前就不知去向。

Her husband died 10 years ago but she has since remarried.
她丈夫于十年前去世,但她后来又嫁人了。

I've long since forgotten what our quarrel was about.
我早就忘掉我们为什么吵架了。

It was not long since that I returned.
我是在不久前回来的。

He came to London 3 years ago and has pved here ever since.
他三年前来到伦敦,此后就一直住在这里。

用作连词(conj.)

Since I left college,I have not seen him.
自从我从大学毕业以后,就没有见过他了。

They have never been to see me since I was ill.
自从我生病之后,他们一直没来看过我。

Since I have owned a bicycle,I have gone to school by it every day.
自从我有了一辆自行车后,我每天骑车上学。

I have known him ever since I was a child.
我自孩提时代起就已经认识他了。

It is ten years since she left me.
自从她离开我已经十年了。

It is five years since he left here.
他离开这儿已有五年了。

It is three years since I have seen him.
我已经三年没见到他了。

It was four months since we had been here.
我们已经有四个月没来这了。

His health is much improved since he gave up smoking.
他自戒烟以来,健康状况大大改善。

I met him last week.Since we left school, we had often written to each other.
上周我遇见了他。自从我们离开学校后,我们曾经常互相写信。

The man has been drinking beer ever since the party started.
宴会开始以来,那个男人就一个劲儿地喝着啤酒。

She has been collecting stamps since she was a child.
她从小起就一直在集邮。

Since it is late,I shall go home now.
由于时间晚了,我现在要回家了。

Since you are so sure of it, he'll bepeve you.
既然你对此这么有把握,他会相信你的。

【近义词】

• as同样地
• while当 ... 的时候...
• for为
• ago以前
• back后面
• whereas然而
• thank感谢
• because因为
• seeing as鉴于
• meanwhile其间
• in the meantime与此同时
• subsequently后来
• later后来
• since因为
• then那么
• before在 ... 以前