My mother often does some shopping at the weekends.改成否定句怎么改?

do some shopping 是固定短语“ 购物”,类似的还有：do some cleaning,do some reading
否定句; My mother doesn't do any sopping at the weekends.
不明白的再问哟,请及时采纳,多谢!
再问： 固定短语不就应该用 My mother doesn't do some shopping at the weekends
再答： 否定句还是要将 some 变为any 的
再问： 好吧