"I am sitting at the table."
Translation:Mi sidas ĉe la tablo.
"sur la tablo": You're sitting on top of the table. "apud la tablo": You're sitting, and the table is so close you can touch it, but you you may not be turned towards the table. "ĉe la tablo": You are sitting close enough to the table to use it, with your body turned towards the table.