This may sound hard to believe but I do know the difference and don't understand why I get it wrong so frequently. It seems to me that I just have a habit of using the wrong one as I do with there and their, etc.

My spelling has always been bad and I suppose I should put my posts through a spell checker to eliminate some of the errors but I am lazy. My grammar used to be reasonable but both of these seem to have deteriorated since I started using computers. The spelling checkers combined with my laziness have done nothing to help my spelling and in reading so much incorrect grammar on the internet and doing little other reading, in addition to my mistakes where I know the rules, I sometimes find myself unable to remember what is and isn't correct - all my fault.

To complicate matters further, I make numerous typos and I am a lousy proof reader (and worse on screen than on paper). I have an advantage over most here in that I can correct my own mistakes in a post but it would take me several edits to eliminate all errors (I tend to spot one or two as soon as I hit submit but even if I corrected them, I would find more later) so I tend to leave my posts alone and hope that people can understand me. Jon