so was sb与so does sb的区别

so be sb 用在 上文的动词是“be动词”的情况
eg.my father is fine.so is my mother
so do/does/did sb 用在 上文的动词是“一般动词”的情况
eg.he like foot.so do i
so have/has/had sb 用在前面的时态是“完成式,过去完成式”等
eg.he has been to Singapore.so have i