sentence: It must be the aftereffect of whatever those clowns in masks have done to me . I want to shut down all the noises around me , especially those whispered shouts coming from behind .
modified: It must have been the aftereffect of whatever that clowns in masks have done to me . I want to shut down all the noises around , especially those whisper shouts coming from behind .
transformation: VERB:TENSE, DET, PRON, VERB:FORM