Chuyển các câu sau sang câu bị động
1:Mary types letters in the office
2:his father will help you tomorrow
3:science and technology have completely changed human life
4:peter broke this bottle
5:they are learning english in the room
6:nothing can change my mind
7:no one had told me about it
8:idon't know her telephone number
9:my students will bring the children home
10:they sent me a present last week
Mong các bạn giúp đỡ !! Trân thành cảm ơn!