1,你正在找什么？我正在找一些关于科学的书。2，我的自行车失踪了，你有没有在哪个地方看过？3，昨晚他被听见在窗外唱歌。4，我很确定我们还需要带什么。5，我好久没收到我笔友的来信了。
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What are you looking for ? I am looking for a book about science.My bike lost. Did you see it somewhere?He was heard of singing a song out side of the window.I am sure about what more we should take.I have not received any letter from my pen pal for long time.