变为被动语态

1My mother look after my little brother 2We heard her sing in the nest room

1. My little brother is looked after by my mother.

2. She was heard to sing in the next room.

1My little brother 被my mother look after2She 被us heard sing in the nest room

1 My little brother was taken fater by My mother .

2 her sing was heard by us in the nest room ,

MY LITTLE BROTHER IS LOOKED AFTER BY MY MOTHER

SHE WAS HEARD TO SING IN THE NEST ROOM BY US

My little brother was been looked after by my mother.

Her sing(?是singing吧) was been heard by us in tne next room.

my little brother is looked after by my mother

her sing was heard by us in the nest room