I searched for this and it seems there's no question asked before.<br/><br/>1. There is a book on the desk.<br/><br/>2. A book is on the desk.<br/><br/>Q1) How are #1 and #2 different?<br/><br/>Q2) What is the part of speech for 'there'? (adjective? adverb?)<br/><br/>Q3) Is there any original form of #1? (Is it just form by itself or from another sentence?)<br/><br/>Q4) There is hardly any tea <u>left</u>.<br/><br/> I don't know how 'left' which looks <i>the past participle</i> can come in a <i>there is</i> phrase.