Hello,<br/><br/>Could you tell me please if these sentences are right?<br/><br/>I have two years experience.<br/><br/>I have a two years experience? <br/><br/>I have a two year experience.<br/><br/>Or<br/><br/> a two year(s) experience is necessary.<br/><br/> two years of experience is needed.<br/><br/> two years experience is neded.