Please help me in understaning these sentences:<br/><br/>1. Video has been playing for two hours.(Please explain the correction as well)<br/><br/>2. I have been knowing the secret.<br/><br/>3. Where has he been going since one hour?<br/><br/>4. Each must go there.<br/><br/>Thnx a lot in advance<br/><br/>regards<br/><br/>chasteguy