否定形式是did not work。

In many cases that strategy did not work.

在很多情况下，这种策略并不奏效。I worked quite irregular hours.

我的工作时间很不固定。

She worked abroad for a year.

她在国外工作了一年。

We worked far into the night.

我们工作到深夜。

He worked sixteen hours a day.

他每天工作16个小时。

He worked in a travel agent's.

他在一家旅行社工作。