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/SinceFor/lhpm/post.htm#56333Sat, 20 Nov 2004 12:23:31 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:56333paco20040http://www.englishforums.com/English/SinceFor/lhpm/post.htm#56333http://www.englishforums.com/English/comments12-56333.xmlHanuman <br /> <br />I'm not interested much in what word belongs to what part of speech, but as far as I know both of 'for' and 'since' in your sentences are classified as <STRONG>prepositions</STRONG> in most dictionaries (including OED and Webster). <br /> <br />for X = during the time span of X <br />since X = during the time from X up to now. <br /> <br />paco <br />http://www.englishforums.com/English/SinceFor/lhxm/post.htmSat, 20 Nov 2004 08:08:01 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:56316hanuman_20001http://www.englishforums.com/English/SinceFor/lhxm/post.htmhttp://www.englishforums.com/English/comments12-56316.xmlSir, <br /> <br />I have live in Japan for 3 years. <br /> <br />I have lived in Japan since 1942. <br /> <br />Here "since" and "for" are working as adverb or conjuction. <br /> <br />Please clear me . <br /> <br />Thanks. <br /> <br />