When the teacher came in, Jim was drawing a horse on the blackboard.
老师进来的时候，吉姆正在黑板上画一匹马。
Lin Feng was drawing a horse on the blackboard, when the teacher came in the classroom.
老师走进教室时，凌峰正在黑板上画马。
I was drawing a car on the blackboard when the teacher came into the classroom.
我正在黑板上画一辆小汽车，那时老师走进教室。
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