I remember someone has distinguished between the two while some said they are interchangeable.
What do you think?
Thanks a lot.
Last edited by Rover_KE; 08-Dec-2012 at 08:08.
Reason: Adding capital letter and full stop.
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I found that by typing can not/cannot in the Google Custom Search box at the top of the page.
Last edited by Rover_KE; 08-Dec-2012 at 13:26.