On Sunday afternoon he went to the National Gallery.
We are very sorry to drag you here on a Sunday afternoon.
on Sunday afternoon 和 on a Sunday afternoon 究竟有何区别呢?
另外,如果将不定冠词a换成定冠词the, 即on the Sunday afternoon是不是特指某个星期天的下午呢?还是等于on Sunday afternon呢?
(因为in winter=in the winter,所以我类似推测)
On Sunday afternoon 既可以表示习惯,例如,He usually goes swimming on Sunday afternoon.
也可以表示具体某个周日下午,即离语境所表示的时间最近的那个周日的下午。例如,
He bought a car on Saturday,and then he had a car accident on Sunday afternoon.
on a Sunday afternoon则指诸多周日下午中的一个。
通常不用定冠词。
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