I have a question that bothers me and I hope someone could help me.<br/><br/>Adapted from Nicholas Sparks's <i>The Guardian</i>: "Richard leaned forward when he saw her <b>appear</b> in the window, her face illuminated."<br/><br/>May I know why it's '<b><i>appear'</i></b> and not <b><i>'appeared'?</i></b><br/><br/>Thank you.