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。
When he got school, the first class had begun.
他到校时，第一节课已经开始了。
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。
It was Monday morning, and the writing class had just begun.
那是星期一的早晨，写作课刚刚开始。
Perhaps it's been a life-long problem – at college, you were always sloping into class five minutes after the professor had begun.
也许这是你一辈子都要克服的问题——在大学里，你总是懒洋洋地在教授开始上课后5分钟才不慌不忙地走进教室。
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。
And the teacher had begun the class when I went into the classroom.
并且老师已经开始上课我走进教室。
And the teacher had begun the class when I went into the classroom.
并且老师已经开始上课我走进教室。
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