a half of girls()in the classroom 填 is 还是are a group of girls()in the classroom 填 is 还是are
问题描述：
a half of girls()in the classroom 填 is 还是are a group of girls()in the classroom 填 is 还是are
答
前一个填写 are 一半的女生在教室,一半女生,还是多个人,所以为复数
后一个填写is 一组女生在女生,这里以群,组为单位,是一个单位,为单数,用is