求问曼哈顿语法中关于现在完成时的知识点

feyonce

“when we use the present perfect, we don't usually have a second event, because the second 'event' is the present. on the other hand, when the time described in a sentence is actually in the past (because of the way the sentence is narrated), then whatever would normally occur in the present perfect must be translated into the past perfect.

here are two examples to illustrate.
it is december 2007; the world record in the discus throw has stood since 1986.
it was july 1991; the world record in the long jump had stood since 1968. --> but it was broken later that year ”