since連詞和介詞區別

用作介詞，意思是“從……以來，自從”，常與完成時連用.

如：I haven’t written home since Christmas.自聖誕節以來，我未曾寫信回家.

用作副詞，意思是“從那時以後(一直到現在)”，“其後(到現在之間)” ever since從那以後一直 (更加強調since的用法).

Things have not changed very much since.從那時起，情況並沒有太大的改變.

His first book was a great success and he has been famous as a writer ever since.

他的第一本書非常暢銷，從那時起他就成了一位名作家.

He got a job with the firm in 1970 and has worked there ever since.

他從1970年開始在那家公司任職，之後就一直在那裡工作.

用作連詞

引導原因狀語從句，相當於now that，意思是“因為……，既然……，鑑於……”.

如：Since the rain has stopped，let’s go for a walk.既然雨停了，我們出去散散步吧.

Since we are young，we shouldn’t be too afraid of making mistakes.

因為我們還年輕，所以不應該太害怕犯錯誤.