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: 3614.32638)http://www.englishforums.com/English/HowRepresentReasonResult/wwcv/post.htm#41658Fri, 24 Apr 2009 00:18:15 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:41658anon10http://www.englishforums.com/English/HowRepresentReasonResult/wwcv/post.htm#41658http://www.englishforums.com/English/comments12-41658.xmlIs the follow sentences right? For the devices are often powered by batteries with limited weight and lifetime, power control become a main concerned issue for reserving the energy. Because the devices are often powered by batteries with limited weight and lifetime, power control become a main concerned issue for reserving the energy. Are the following sentences right/correct? The conjuction "for" is not used (not that I have seen anyway) at the beginning of a sentence. So you could rewrite your first sentence as.... Power control became a major issue for conserving energy, for the devices are often powered by batteries with limited weight and lifetime. notes: 1) become should be became 2) reserving is probably...http://www.englishforums.com/English/HowRepresentReasonResult/wwcv/post.htmFri, 24 Apr 2009 00:18:15 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:41654word1http://www.englishforums.com/English/HowRepresentReasonResult/wwcv/post.htmhttp://www.englishforums.com/English/comments12-41654.xmlIs the follow sentences right? For the devices are often powered by batteries with limited weight and lifetime, power control become a main concerned issue for reserving the energy. Because the devices are often powered by batteries with limited weight and lifetime, power control become a main concerned issue for reserving the energy. thanks in advance.