I bought a skirt for her She must take care of her mother 这几句怎么改成被动语态

问题描述:

I bought a skirt for her She must take care of her mother 这几句怎么改成被动语态

A skirt was bought for her by me.
Her mother must be taken care of by her.

The skirt is bought by me for her.
Her mother must be taken care of by her

The skirt is bought by me for her.
Her mother must be taken care of by her.