I'm am a bit confused here. I don't really get what tense I should use after 'has been a long time'. <br/><br/>Are these correct? If not, why? What do they mean?<br/><br/>1. It has been a long time since I <b>called</b> you out.<br/><br/>2. It has been a long time since I <b>have</b> <b>called</b> you out.<br/><br/>3. It has been a long time since I <b>had</b> <b>called</b> you out before that dinner we had..<br/><br/>4. It has been a long time since I <b>had</b> <b>called</b> you out.<br/><br/>Thanks.