Can I say, "This is the place that I was born"?<br/><br/>How about the following case?<br/><br/>Argon gas welding is a welding method <u>where </u>a welding rod is melted while argon gas shuts off the oxygen in the atmosphere.<br/><br/>Can I use "that" instead of "where"?<br/><br/><span style="color:rgb(136,136,136);">(edited by mod. to fix bad formatting)</span>