Hello<br/><br/>When talking about your job, you have to use the indefinite article. For example,<br/><br/>He is <b>a</b> teacher. (<del>He is teacher.</del>)<br/><br/>Do we have to use the indefinite article in the following sentence as well?<br/><br/>He works as <b>(a)</b> consultant.<br/><br/>And would the same go for "serve as" and "act as"?<br/><br/>Thanks in advance.