Hello,<br/><br/>Could you, please explain to me the use of underlined 'what'?<br/><br/>Did you find your birthday present yet?<br/><br/>I found the box, but it was empty.<br/><br/>Are you sure?<br/><br/>Did you check?<br/><br/>Check again.<br/><br/>Every year I thought it was my father<br/>who left me shoes on my birthday.<br/><br/>But all this time, it's been...<br/><br/>Tell me <u>what</u> it opens.<br/><br/>How would I know?<br/><br/>Thanks