Hi....<br/><br/>Please help.<br/><br/>I did it myself.<br/>I did it by myself.<br/><br/>Do they mean the same?<br/><br/>You can go watch a movie at <b>the</b> cinema.<br/><br/>Can anyone please explain why must we use <b>the</b> in the sentence ?<br/><br/>Can we use <b>a</b> instead, as in "You can go watch a movie in a cinema."<br/><br/>Thank you.