有一次她病了，但仍坚持给我们上课。
有一次我上课睡着了，醒来时发现竟然已经在上另一节课了！
One time I fell asleep and woke up in the middle of a different class.
他上课老是不说话又心不在焉，以致于老师有一次说他笨。
He was so dreamy and quiet that a teacher once called stupid.
有一次方老师上课，提了个问题：“谁来背一背《绝句》？”
There is a teacher, a question: "who is reciting" quatrains "?
有一次我们发现他在上课时打盹。
有一次，我同桌呆了一个机器人，上课接着下课玩。
On one occasion, I spent a robot table, followed by school classes to play.
有一次我发现他在上课时睡着了。
有一次我发现他在上课时睡着了。
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