sentence: Peter drove his car to the doctor 's clinic and after half an hour he arrived and he and his grandmother went up the stairs to reach the doctor 's clinic . After they arrived , they found that they had to wait a period of time to take their turn . They waited and then their turn came . They entered the doctor 's surgery and the doctor was very kind . He welcomed them and after checking Peter 's grandmother , said
modified: Peter drove his car to the doctor 's clinic and after half an hour he arrived and he and his grandmother go above through the stairs to reach the doctor 's clinic after they arrived they found that they have to stay aperiod of time to take his turn they waited and then their turn came .they entered the doctor and the doctor was very kind he welcomed them and after check peter 's grandmother .
transformation: VERB:TENSE, PREP, PUNCT, PUNCT, VERB:TENSE, VERB, ORTH, DET, PUNCT, ORTH, OTHER, PUNCT, VERB:FORM, ORTH, OTHER