She often watch TV on Saturdays.改错 Sandy and Jack usually piays the piano on Sundays.改错两道改错题
问题描述：
She often watch TV on Saturdays.改错 Sandy and Jack usually piays the piano on Sundays.改错
两道改错题
答
She often watches TV on Saturdays
Sandy and Jack usually piay the piano on Sundays.
第一题是第三人称单数,加s
第二题是复数,用原型