昨天你找到你的弟弟时，他正在踢足球吗？
Was your brother playing football yesterday when you found him?
昨天他花了两个小时踢足球。
昨天踢足球的时候他被重重的撞倒在地，手臂折断了。
While playing foot yesterday, he was knocked down heavily and had his arm broken.
他昨天踢足球时把腿弄骨折了。
He had his leg broken while he was playing football yesterday.
昨天他踢足球了。
昨天他花了两个小时踢足球。
昨天他花了两个小时踢足球。
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