Ответы и объяснения

1.       Many mistakes are usually made by us.
2.       Flowers are grown in the gardens by people.
3.       Letters will be sent tomorrow by her.
4.       Moscow was founded in 1147 by Prince Yuri Dolgoruky.
5.       The place was destroyed by the fire.
6.       My presents will be got next week by me.
7.       These stories were written by him many years ago.