Hi,<br/><br/>I'm having trouble understanding the difference in meaning for these two setences.<br/><br/>1. The tickets can only be used <b>on</b> Sundays. (what does this one mean when using 'on'?)<br/><br/>2. The tickets can only be used <b>for</b> Sundays. (what does this one mean when using 'for'?)<br/><br/>Thanks!