sentence: There are many parks and green areas close to this city where young people can spend their time outdoors and have fun all day before going out , such a park is called San francisco , which has a big lake and local young people usually have barbecues there after they have done some water sport or rented a boat .
modified: There are many parks and green areas close to this city where young people could spend their time outdoors and having fun during all day before going out , such a park called : San francisco , which has a big lake and local young people are used to having barbecues there , after they had done any water sport or rented a boat .
transformation: VERB:TENSE, VERB:FORM, PREP, VERB:TENSE, PUNCT, OTHER, VERB:FORM, PUNCT, VERB:TENSE, DET