since
英 [sɪns] 美 [sɪns]
prep.
自从;自…以后;从…以来;(表示气愤)何曾，什么时候
conj.
因为;由于;既然;从…以后;自…以来
adv.
自…以后;从…以来;此后;后来
例句
She's a changed woman since she got that job.
她自从得到了那份工作，变得判若两人
His quality of life has improved dramatically since the operation.
手术后他的生活质量大大改善了。
The children are completely out of control since their father left.
这些孩子自他们的父亲离开后就无法无天了。
