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: 3616.28671)http://www.englishforums.com/English/NeededOrIsNeeded/wlzz/post.htm#42593Sun, 26 Apr 2009 17:21:06 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:42593Mister Micawber0http://www.englishforums.com/English/NeededOrIsNeeded/wlzz/post.htm#42593http://www.englishforums.com/English/comments12-42593.xmlThe first one, Word, but it requires other revision, I think, also: '1) An analysis model is needed to understand how many extra-collisions are actually brought up by the power control protocol. ' And are you sure that 'extra-collisions' should be hyphenated?http://www.englishforums.com/English/NeededOrIsNeeded/wlzz/post.htmThu, 26 Mar 2009 18:21:06 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:42573word1http://www.englishforums.com/English/NeededOrIsNeeded/wlzz/post.htmhttp://www.englishforums.com/English/comments12-42573.xmlhello, following sentence which one is correct? 1)an analysis model is needed to know how many extra-collisions actually brings up by the power control protocol. or 2)an analysis model needed to know how many extra-collisions actually brings up by the power control protocol.