Hello,<br/><br/>1. We will leave on Sunday.<br/><br/>2. We will leave on the next Sunday.<br/><br/>3. We will leave on next Sunday.<br/><br/> Between (2) and (3), which one is correct?<br/><br/>I would also like to know that when I should use 'the' in case of 'next month, 'next week' and should not.<br/><br/>Could any one suggests the rules?<br/><br/>Thanks.