将下列句子改为被动语态.1、Travelers visit the Great Wall every year.2、We

The Great Wall is visited by travellers every year.
Chinese is learnt by us at school.
Clothes are washed by her on weekends.
Are knives used by people to cut things?
Classroom isn't cleaned by the students in the morning.
Vegetables are grown by him on the farm.

1.The Great Wall is visited by travelers every year
2.Chinese is learnt by us at school
3.Clothes are washed by her on weekends
4.Do knives are used by people to cut things
5.the classroom isn't cleaned by students in the morning
6.The vegetables are grew by him on the farm