Murphy, Raymond. <br/><br/>
English grammar in use / 
Raymond Murphy. 
 - 2a ed. 
 - Australia :  Cambridge,  1994. 
 - 306 p. 
<br/><br/>Present and past.--Present perfect and past.--Future.--Modals.--Prepositions.--Conjunctions and prepositions 
<br/><br/><label>ISBN: </label>052143680X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ingles--Gramatica.
<br/><br/><label>Dewey Class. No.: </label>421  / M87e