sentence: The sky was cloudy , the temperature was below zero , the wind made him not able to walk and it was then that he realized why is sister was celebrating her wedding on this date .
modified: The sky was cloudy , the temperature was below zero , the wind made him not being able to walk and it 's now when he realized why was her sister celebrating her wedding on these dates .
transformation: VERB, CONTR, ADV, OTHER, OTHER, DET, NOUN:NUM