Mulan told me her class had begun studying frogs.
穆兰告诉我，在课堂上，已开始学习有关青蛙的知识了。
Arriving at the school, we found that class had begun.
我们赶到学校时，发现已经开始上课了。
Although I was unaware of it, our last class had just begun.
尽管我对此毫无知觉，我最后的课程已经在刚才开始了。
The class had already begun when I came to school.
我来到学校时，已经开始上课。
The class had already begun when I came to school.
我来到学校时，已经开始上课。
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