He has been there since two weeks ago.

两周以来，他一直在那儿。

youdao

He has taught you English since two weeks ago, hasn't he?

他从两周前就教你们英语了，对吗？

youdao

I have applied for my social security number since two weeks ago.

我己经申请社会安全码将近两个星期了。

youdao

The U.S.military has been searching for Private Bergdahl for about two weeks, since he reportedly disappeared during a patrol.

VOA: standard.2009.07.20

It's been more than two weeks since Pakistani-American Faisal Shahzad allegedly attempted to detonate a bomb in New York City's crowded Times Square.

VOA: standard.2010.05.18

European skepticism about the vaccine comes as the Stockholm-based European Center for Disease Control and Prevention reports the number of deaths in Europe due to the H1N1 virus has been doubling every two weeks since mid-October.

VOA: standard.2009.11.25

This free iPhone app, has garnered nearly 200, 000 downloads since its release two weeks ago.

FORBES: By Being Unorthodox, Kraft Transforms Itself Into A Creative Powerhouse

Markets have been showing great commitment to this bounce since it started two weeks back.

FORBES: New Life For Apple, Facebook, Google As Walking Dead Start Running Again

Here's what I knew - David had been living in this orphanage since he was two weeks old.

BBC: ON DAVID