http://www.englishforums.com/English/GeneralEnglishGrammarQuestions/Forum12.htmAsk your questions on grammar and get your sentence checked. We answer lots of different types of general English grammar questions here.enCSMOD (Build: 3107.25864)http://www.englishforums.com/English/UsageOfCouldBeAndCould/cpbvm/post.htm#241106Thu, 29 Jun 2006 07:28:01 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:241106rishonly0http://www.englishforums.com/English/UsageOfCouldBeAndCould/cpbvm/post.htm#241106http://www.englishforums.com/English/comments12-241106.xml<P>Hi,</P> <P>"Could trace" is in active form ,and "could be traced" is in passive form.<BR></P> <P>The police <EM>could trace </EM>the thieves immediately. (Active)</P> <P>The thieves <EM>could be traced </EM>by police immediately. (Passive)</P><div style="clear:both;"></div>http://www.englishforums.com/English/UsageOfCouldBeAndCould/cpbvj/post.htmThu, 29 Jun 2006 07:12:41 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:241103Anonymous0http://www.englishforums.com/English/UsageOfCouldBeAndCould/cpbvj/post.htmhttp://www.englishforums.com/English/comments12-241103.xml<P>Hi,</P> <P>Please clarify, when can we use "could be traced" and "could trace" in a sentence.</P> <P>with thanks and regards,</P> <P>Kannan</P><div style="clear:both;"></div>