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...
...ers share their entrepreneurial
journey 您好，请问怎么理解这里的in which的用法呢?如果可以的话，希望能够得到in which的用法解释，实在理解不了。Introducing CBS Startup Stories, a
new video series in which alumni founders share their entrepreneurial journey,
f...
...，情态动词与助动词一样，须后接动词原形，……。”我的质疑是： 1，而在具体的情态动词用法的小节中，不止一处却非也。如：情态动词must
：
It is six o’clock. She must have come home.
——have come，并非动词原形。He must have been ...