Dear teachers and friends,<br/><br/>What is the proper question If I want to ask someone whether something that he/she has done is working or not.<br/><br/>“was this worked before”<br/><br/>or<br/><br/>“has this worked before”<br/>What is the different between these 2 sentences.<br/><br/>Which one is better/correct or is there any better idea than this?<br/><br/>Thanks in advance.