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on Sundays: 所有的星期天,每逢星期天,与一般现在时连用，表示经常性的行为。
介词on一般用于表示某一天的时间短语中：on Monday，on Monday morning，on that day
当使用last，next，this，that时，介词（以及定冠词）必须省略：
I’ll see you next/this Friday.
在表达卧床时bed前不需加冠词：
It’s time for bed now.
You must stay/remain in bed for another two days. 你必须再卧床两天。
The writer always gets up late on Sundays.
He got up late last Sunday.
His aunt telephoned then.
he had just arrived by train.
She was coming to see him.
He said,'I am still having breakfast'.
His aunt was surprised.
It was one o'clock.
