http://www.englishforums.com/English/GeneralEnglishGrammarQuestions/Forum12.htmAsk your questions on grammar and get your sentence checked. We answer lots of different types of general English grammar questions here.enCSMOD (Build: 3273.32735)http://www.englishforums.com/English/AddToThat/gddqz/post.htm#517009Thu, 22 May 2008 07:42:31 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:517009Liveinjapan0http://www.englishforums.com/English/AddToThat/gddqz/post.htm#517009http://www.englishforums.com/English/comments12-517009.xmlI found where <i>that </i>refers, and I understand the whole sentence.</p><p>Thanks, CB.&nbsp;<div style="clear:both;"></div>http://www.englishforums.com/English/AddToThat/gddpq/post.htm#517003Thu, 22 May 2008 07:33:49 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:517003Cool Breeze1http://www.englishforums.com/English/AddToThat/gddpq/post.htm#517003http://www.englishforums.com/English/comments12-517003.xml&nbsp;Hi LiJ</p><p><i>Add</i> is a verb (imperative), <i>to</i> is a preposition <i>add</i> requires and <i>that</i> is a demonstrative pronoun which refers to something mentioned previously.</p><p>CB&nbsp;<div style="clear:both;"></div>http://www.englishforums.com/English/AddToThat/gddpl/post.htmThu, 22 May 2008 06:48:29 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:516998Liveinjapan2http://www.englishforums.com/English/AddToThat/gddpl/post.htmhttp://www.englishforums.com/English/comments12-516998.xml<u> Add to that</u> the serendipity of the Berkeley team viewing the same region with an optical light telescope.&nbsp; </p><p>How does the underlined part work in the sentence?</p><p>&nbsp;</p><p>Thanks</p><p>&nbsp;</p><p>&nbsp;<div style="clear:both;"></div>