She's a changed woman since she got that job.
她自從得到了那份工作，變得判若兩人。
She's been using since she was 13.
她從13歲起就吸毒。
His quality of life has improved dramatically since the operation.
手術后他的生活質量大大改善了。
It's a long time since they left.
他們已經離開很久了。
It's been two weeks now since she called.
她到現在已經有兩個星期沒來電話了。