has been strengthening has been stressed has been stretched has been stripped has been striving has been strongly has been struck has been structured has been struggling has been stuck has been studied has been studied as has been studied extensively has been studying has been subject has been subjected has been submitted has been subsequently has been substantial has been substantially has been substantiated has been substituted has been succeeded has been successful has been successfully has been successfully added has been successfully applied has been successfully completed has been successfully implemented has been successfully sent has been successfully tested has been successfully used has been such a long has been suffering has been sufficient has been sufficiently has been suggested has been summarized has been summoned has been sung has been super has been superseded has been supplemented has been supplied has been supplying has been supported has been supporting has been supportive has been suppressed has been surpassed has been surprisingly has been surrounded has been suspected has been suspended has been sustained has been swallowed has been swept has been swimming has been switched has been switched off has been sworn has been synonymous has been synthesized has been tabled has been tagged has been tainted has been taken has been taken away has been taken care has been taken hostage has been taken into account has been taken off has been taken out has been taken over has been taken prisoner has been taken up has been taking has been taking care has been taking place has been talk has been talked has been talking has been talking about has been talking to me has been tampered has been tapped has been targeted has been tarnished has been tasked has been taught has been teaching has been telling has been telling me has been telling us has been temporarily has been termed has been terminated has been terrible has been tested