Как будет в passive voice : my friend teaches me english. john found a small silver box office the garden. mrs morrison will hang the picture on the wall. the guests sang us the song. people build a lot of skyscrapers. my granny will grow the flowers is her garden

I am taught English by my friend 
A small silver box was found in the garden by John
The picture will be hung on the wall
We were sang the song by our guests
a lot of skyscrapers are built by people
The flowers will be grown in the garden by my granny