<br style="color:rgb(17,17,17);background-color:rgb(252,252,252)!important;"/>Professor, Allan Chang, who refused the transplant team permission <b>to use</b> the liver, has been severely criticised.<br/><br/>Professor, Allan Chang, who refused the transplant team permission <b>using</b> the liver, has been severely criticised.<br/><br/>Which one should be used and why?<br/><br/>When do we use this structure?