sentence_A: Four people are walking along a city sidewalk and the one in the green hat is phoning someone
sentence_B: Four people are walking along a city sidewalk and the one in the green hat is talking on a cell phone
sentence_A_original: four people are walking along a city sidewalk, while the one in the green hat talks on a cellphone
sentence_B_original: four people are walking along a city sidewalk, while the one in the green hat talks on a cellphone