1. Who have you been here with?<br/><br/><b>Is this sentence correct?</b><br/><br/>2. I'm gonna be in New York for my friend's birthday party. <br/><br/>or<br/><br/>I'm gonna be there for a friend's birthday party.<br/><br/><b>Are both useable and interchangeable?</b><br/><br/>3. Look at all the pigs. And<br/><br/>Look at all these pigs. And<br/><br/>Look at all those pigs.<br/><br/><b>What's the difference between the three?</b><br/><br/>Thank you.