1、While the work was difficult，it was interesting。 虽然这工作很困难，却很有意思。
2、While I understand what you say， I can’t agree with you。 虽然我理解你的意思，但还是不同意。
3、While the music teacher was singing，the students were learning。 音乐老师唱歌时，学生们在学习。
4、While he was fishing，I was painting。 他在钓鱼的时候，我在画画。
