<html><p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'>In these sentences, we need the relative clause to define the people and the conference:<!--?xml:namespace prefix = "o" ns = "urn:schemas-microsoft-com:office:office" /--></span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'> </span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt; tab-stops: 35.45pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'><span style="mso-tab-count: 1;"> </span>These are the people <span style="color: rgb(0, 0, 204);">who</span> attended the conference.<span style="mso-spacerun: yes;"> </span><span style="color: rgb(255, 51, 153);"></span></span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt; tab-stops: 35.45pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'><span style="mso-tab-count: 1;"> </span>They went to the conference <u><span style="color: rgb(0, 0, 204);">that </span>was in Paris.</u><span style="color: rgb(255, 51, 204);"></span></span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'> </span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'>If we only say, "These are the people"<span style="color: rgb(0, 0, 204);"> </span>or "They went to the conference", there is some information missing - we might not know which people or which conference.</span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'> </span></b></p> <p class="ecxmsonormal" style="background: white; margin: 0cm 0cm 0pt;"><b><span lang="EN-US" style='font-family: "Arial","sans-serif";'>In these kinds of sentences, we do not use commas and we can use <span style="color: rgb(0, 0, 204);">that</span> instead of <span style="color: rgb(0, 0, 204);">who</span> and <span style="color: rgb(0, 0, 204);">which</span>. <span style="color: rgb(0, 0, 204);">That </span>is more common in conversation. Here are some examples:</span></b></p> <p class="ecxmsonormal" style=" |