Hi. I think the sentence is correct. Is this common to use the word "when" like this (in this context)?<br/><br/><i>A compliment is <b>when</b> you say something nice to another person.</i><br/><br/>How about this? I think this is correct too.<br/><br/><i>A compliment is something nice you say to another person.</i><br/><i> </i>