Can I say,<br/><br/>(i) They were doing works with the computers in the cybercafe. <br/><br/>(b) They were playing computers games.<br/><br/> They were playing computer games.<br/><br/>(c) They are playing in the cycbercafe. (Does it mean they were playing the computer games?)<br/><br/>(d) They are playing the games in the cycbercafe. (Does it mean they were playing the computer games?)