why should you be sorry?

问题描述:

why should you be sorry?
为什么要加be呢?

i "am" sorry
you "are" sorry
he "is" sorry
they "are" sorry
引号部分为BE动词
你给出的问句中,should为助动词,后面的BE动词要转回原形,就是说本来的"are"转为be,故.