don't be so rude to your father

don't be so rude to your father
don't be so rude to your father

don't be so rude to your father
rude是形容词粗鲁的,变否定祈使句,以助动词开头,要加be动词,有语法功能,没实际意义,就像Don‘t be late,中的be一样.