Hi<br/><br/>Are these natural expressions?<br/><br/><b>Mess up</b> the bed sheets [by jumping on them, etc]<br/>The children messed up the bed sheets again.<br/><br/><b>Crumple</b> the bed sheets<br/>The children have again crumpled the bed sheets.<br/><br/><b>Smooth out</b> the bed sheets?<br/><br/>Are there better expressions?<br/><br/>Thanks,<br/><br/>Tom