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。