My sister and i don't have piano lessons twice aweek.谁是主语?这句子还能怎么改?

My sister and i don't have piano lessons twice aweek.谁是主语?这句子还能怎么改?
My sister and i don't have piano lessons twice aweek.谁是主语?这句子还能怎么改?

My sister and i don't have piano lessons twice aweek.谁是主语?这句子还能怎么改?
My sister and i 是主语

Neither my sister nor I have piano lessons twice a week.
原句主语：My sister and I

My以及I为主语;还可以改为：I don`t have piano lesssons twice aweek with my sister.