It's often at nine

九点───9 o'clock;经常───often

I have a history class at 9 o'clock.───我9点钟有历史课。

The next crew relief comes on duty at 9 o'clock.───下一批换班的员工9点钟接班。

Church is at 9 o'clock.───礼拜仪式9点钟开始。

The notice did not name the dead person, but the sale was to be held at 9 rued'Antin on the 16th, between noon and five o'clock.───广告上没有提到死者的姓名，只是说拍卖将于十六日中午十二点到下午五点在昂坦街九号举行。

If it hadn't been snowing so hard, I might have been home by 9 o'clock.───说明由于雪太大，说话者未能正在9点前到家。也就是说shewasdelayed。

I always leave home at 8 o'clock . I begin work at 9 o'clock. I work at all day and often get home late at night.───我总是8点钟离家，9点钟开始工作。我工作一整天，常常是晚上很晚才到家。

The mailman always comes at 9 o'clock.

I've invited them for 9 o'clock.

Tune in to BBC tonight at 9 o'clock.

We're meeting him at 9 o'clock tonight.

At 9 o'clock the patient was wheeled in.