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