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/CanCouldWouldMay/zgqbx/post.htm#451781Sat, 25 Apr 2009 19:13:29 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:451781Cool Breeze0http://www.englishforums.com/English/CanCouldWouldMay/zgqbx/post.htm#451781http://www.englishforums.com/English/comments12-451781.xmlAfter having a quick look at your examples, I think you are right. However: "Could you do" something is the same as asking if you were able to do it. And you are usually not referring to one incident but an ability : Could you swim when you were five years old? But: Were you able to get in last night even though you had lost your key? CBhttp://www.englishforums.com/English/CanCouldWouldMay/zgqbx/post.htmSat, 25 Apr 2009 19:13:29 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:451738Anonymous1http://www.englishforums.com/English/CanCouldWouldMay/zgqbx/post.htmhttp://www.englishforums.com/English/comments12-451738.xmlAm I right about these?: Can you cook? (I’m asking if you are good at cooking, if you know how to cook) Could you please help me to dust off the counter?(I’m politely asking for someone’s help) Can and could work pretty much the same way; could is a little more formal and polite, but there really isn’t much difference Would you do something for me? (is a request) May I? (you ask permission for something) May I ask you why you didn’t tell them the truth? " Could you" do something? is the same as asking if you are able to do it. " Would you" is a request . thanks