since引导的是什么从句

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。

She's been using since she was 13.

她从13岁起就吸毒。

His quality of life has improved dramatically since the operation.

手术后他的生活质量大大改善了。

It's a long time since they left.

他们已经离开很久了。

It's been two weeks now since she called.

她到现在已经有两个星期没来电话了。