I've been feeling ill since last week, so I am sorry that I can't go to your party.

我从上周开始就感觉不适，所以很抱歉我不能参加你的聚会。

youdao

Since last week it has rained.

自从上周天就一直在下雨。

youdao

I have been hearing the news since last week.

上个星期我就听说这个消息了。

youdao

After rising steadily since last week, oil prices dipped for a second consecutive day amid reports of growing U.S.crude inventories.

VOA: standard.2009.08.05

The watchdog group, partly appointed by the U.N., is overseeing the complaints of voter fraud and other irregularities reported since last week's balloting.

VOA: standard.2009.08.24

Also,new claims for unemployment aid fell last week to the lowest number since January.

VOA: special.2009.11.06

"I'm in Norman and it just hit Yukon where I was staying" since last week's storm.

NPR: 2 Dead When Tornado Hits Oklahoma City Area

The plant has been shut since last week following complaints of a gas leak.

BBC: Sterlite Industries plant

The ongoing winter session of parliament has been deadlocked over the issue since last week.

BBC: India parliament to hold economic reforms vote