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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。
- I fear I do not know the answer to that. 我恐怕回答不出那个问题。
- 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。
- I did not know his nephew Jack became a leatherneck. 我不知道他的侄子杰克已加入海军陆战队。
- I did not know that then, although I learned it later. 当时我不知道那件事，然而我后来知道了。
- I do not know how to spell the word " tulip ". 我不知怎么拼"郁金香"这个词。
- 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。
- I do not know if I have been maken myself clear. 我不知道我是否说清楚了。
- I do not know how I would comport myself. 我不知道我应该怎样行动。
- I did not know about it until yesterday. 直到昨天我才知道这事。
- Whoa! I did not know there is student that old ! 哇啊！我不知道还有那么大年纪的学生。
- I did not know his name until a few weeks ago. 到几个星期以前我才知道他的名字。
- I did not know yesterday who you have run into. 我不知道昨天你遇到了谁。
- I do not know how to operate this instrument. 我不知道怎样操作这个仪器。
- I do not know why acid corrodes the metal. 我不知道酸为什么腐蚀金属。
- I do not know what his intention is. 我不知道他的意图是什么。
