What do I have to know or not to see if your new medicine works

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is this sentence correct or make sense should there be a comma after not? wouldn't it be better to write it this way "what do I have to know or not know, in order to see if your new medication works?" or maybe there is no comma after "know" in the second sentence?

asked Jan 31 '13 at 16:40 chris vetrano New member

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"What do I have to know or not know in order to see if your new medication works?"

link comment edited Jan 31 '13 at 17:22 sanjay Expert

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