sentence: I am not used to cooking for this number of people , but I am a hard worker and I am a fast learner , so I am certain that I will be a great help to you this summer .
modified: I am not used to cook to this number of people but I am a hard worker and I am a fast learner , so I am certain that I will be in a great help for you this summer .
transformation: VERB:FORM, PREP, PUNCT, PREP, PREP