老师好。我曾了解到动名词的完成时用来体现该动作发生在谓语动作之前，比如这样的例句，He regretted not having gone to university.  /I appreciate having been given the opportunitiy to study aboard. 都是完成时动作先于谓语动作。 然而，像这样的句子，Do you remember John and his father coming to see us last Christmas？这里的coming to...肯定是发生在remember之前了，而且还应该是间隔着不短的时间，可却没有用having come 来表示，我觉得很奇怪。