当刘凯匆忙进入课堂，老师已经开始教训。
When Liu Kai hurried into the classroom, the teacher had already begun lesson.
当刘凯匆忙走进教室时，老师已经开始了上课。
When LiuKai hurried into the classroom, the teacher had already begun his lesson.
当刘凯急匆匆地赶到教室时，老师已经开始上课了。
When LiuKai hurried into the classroom, the teacher had already begun his lesson.
当刘凯急匆匆地赶到教室时，老师已经开始上课了。
When LiuKai hurried into the classroom, the teacher had already begun his lesson.
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