oth ..and...后面的动词用复数,如： Both he and his mother are going to the shop tomorrow. niether ...nor后面的动词用单数,还是复数取决于和nor相邻的主语是单数或者复数,如： Neither you nor I am a student.这里的单,复数和I保持一致,用am. Neither you nor he is going to the park tomorrow.这里用is,单数. Neither he nor his parents are American.这里用复数.
