since

1. PREP You use since when you are mentioning a time or event in the past and indicating that a situation has continued from then until now. 自…以來; 從…以后

He's been in exile in India since 1959. 他自1959年以來一直流亡印度。

She had a sort of breakdown some years ago, and since then she has been very shy. 她幾年前曾遭遇精神崩潰，從那以后她一直怯生生的。

2. ADV Since is also an adverb. 自那時起[ADV with v]

They worked together in the 1960s, and have kept in contact ever since. 他們在20世紀60年代曾一起工作，自那時起就一直保持著聯(lián)系。

3. CONJ Since is also a conjunction. 自…以來

I've earned my own living since I was seven, doing all kinds of jobs. 我自從7歲就自己謀生，做各種各樣的工作。

4. PREP You use since to mention a time or event in the past when you are describing an event or situation that has happened after that time. 自…以來

The percentage increase in reported crime this year is the highest since the war. 今年報道的犯罪增長率是該戰(zhàn)爭以來最高的。

5. CONJ Since is also a conjunction. 自…以來

So much has changed in the sport since I was a teenager. 自我十幾歲以來，該項運動發(fā)生了很大變化。

Since I have become a mother, the sound of children's voices has lost its charm. 我當了母親之后，孩子的聲音就失去了魅力。

6. ADV When you are talking about an event or situation in the past, you use since to indicate that another event happened at some point later in time. 此后; 后來[ADV with v]

About six thousand people were arrested, several hundred of whom have since been released. 約六千人被逮捕，不過他們中有幾百人后來被釋放了。

7. CONJ You use since to introduce reasons or explanations. 由于; 既然

I'm forever on a diet, since I put on weight easily. 我一直在節(jié)食，因為我的體重很容易增加。