Hello,<br/><br/>Pretend it is your graduation party and you want to appreciate your friends. Which one is correct? and could you explain the difference between them?<br/><br/>I would like to take this opportunity to thank everyone who <u><i>has helped me</i></u>.<br/><br/>or<br/><br/>I would like to take this opportunity to thank everyone who <u><i>helped me</i></u>.<br/><br/>Thank you very much in advance for your help.