http://www.englishforums.com/English/EslGeneralEnglishGrammar-Questions/Forum12.htmAsk your questions on grammar and get your sentence checked. We answer lots of different types of general English grammar questions here. <font color=red>DO NOT post paragraphs and compositions here. Post them in our <a href="http://www.englishforums.com/English/EssayReportCompositionWriting/Forum9.htm"><b>Essay, Report and Composition Writing Forum</b></a>.</font>enXMOD (Build: 3607.32596)http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530513Fri, 23 Jan 2009 12:24:54 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:530513New2grammar0http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530513http://www.englishforums.com/English/comments12-530513.xmlGot it. Thanks.http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530509Fri, 23 Jan 2009 12:24:54 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:530509RonBee1http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530509http://www.englishforums.com/English/comments12-530509.xmlIf you say something could not have happened you are sure it didn&#39;t happen. If you say it may not have happened you are not so sure.http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530494Mon, 23 Mar 2009 12:24:54 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:53049426TMNTJG2PG2http://www.englishforums.com/English/MayCould/gzqjk/post.htm#530494http://www.englishforums.com/English/comments12-530494.xmlYes, you can; but in doing so, you have changed an uncertain situation to be a certain situation. This may not be the original intention of the writer.http://www.englishforums.com/English/MayCould/gzqjk/post.htmMon, 23 Feb 2009 12:24:54 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:530478New2grammar3http://www.englishforums.com/English/MayCould/gzqjk/post.htmhttp://www.englishforums.com/English/comments12-530478.xmlThe agency will send teams of investigators to farms in both locations this weekend as well as to the pathways from those farms in an attempt to determine where the contamination occurred, he said. The tomatoes may not have been contaminated on a farm, he stressed; the contamination could have occurred in a packing shed, warehouse, supplier chain or distribution center. Can I replace may with could here? I know the two modals are different but I&#39;m having difficulty sensing the difference. Thanks in advance.