I've just popped in to return your book.
我突然进来是要还你的书。
Please return your book(s) in thirty(sixty) days.
请您注意还书日期，按时还书。
Shall I book the plane ticket for your return?
我为您预订回来的机票好吗？
You must always return your library book on time.
你一定要按时归还图书馆的书。
When are you to return your library book?
你什么时候要还图书？
You must always return your library book on time!
你必须按时归还图书馆的书！
You must always return your library book on time!
你必须按时归还图书馆的书！
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