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- I do not know why acids eat in metals. 我不知道酸腐蚀金属的原因。
- They do not know what the words mean. 他们不知道这些字的意思是什么。
- I fear I do not know the answer to that. 我恐怕回答不出那个问题。
- We do not know when this world came into being. 我们不知道世界是何时形成的。
- He does not know what to do with his vacant time. 他不知道空闲时间该干点什么。
- Gee! I do not know this guy cry so much when he's drink. 哇啊！我不知道这老兄一喝酒，就会嚎啕大哭。
- Mary took his story at face value and do not know he was joking. 玛丽对他的陈述信以为真，却不知道他是在开玩笑。
- He do not know the true story, so he draw on his imagination. 他不知道事情的真相，于是乎就凭空捏造了。
- People do not know the value of health till they lose it. 直到失去健康，人们才知道健康的可贵。
- Small children are often shy of anyone they do not know. 小孩子在陌生人面前常常是怯生生的。
- Such a young child do not know chalk from cheese. 这样年幼的孩子是不辨是非的。
- I do not know how to spell the word " tulip ". 我不知怎么拼"郁金香"这个词。
- Some kid do not know the courtesy due an old man. 有些孩子不懂得应该如何尊敬老人。
- I am sorry I do not know anything about that. 很抱歉这事我一点儿也不知道。
- I do not know how I can thank you enough. 真不知道怎样感谢您才好。
- I do not know how to say it in English. 我不知道怎样用英语来讲这句话。
- I do not know where to begin counting them. 我不知道该从哪里着手数起。
- I do not know whether he was punished or not. 他是否受到惩罚，我不知道。
- Teacher and student all do not know this thing. 老师和学生都不知道这件事。
- What a yap he be,he do not know how to whisper. 他真是个粗汉，他不会小声地说话。
