her parents are both teacherteacher后加s不?

her parents are both teacherteacher后加s不?
her parents are both teacher
teacher后加s不?

her parents are both teacherteacher后加s不?
加s,因为是复数parents

不加， teacher在这里标职业名称，泛指

不加，TEACHER不用加S

要+

不加s，此处teacher只是指教师这个职业，没有复数之意

可加可不加！