after 用法疑惑

有个句子

Four days after the accident, the authority is putting the new plan for

traffic control into action.

类似的:

Four days after leaving China

Four days after operation

Four days after I leave

时间段+after+ing/n./句子(after可以做连词)

后面after接的成分一直没搞明白规律,什么时候可以加一个名词,什么时候加一个ing分句,什么时候加一个句子(after有时候可以做连词)。比如accident后面没有ended,老师可以解答下吗?

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