when do people often plant trees?改为被动语态

when do people often plant trees?改为被动语态 Where do they often plant trees?改为被动语态拜托了各位 People plant hundreds of trees every year 改为被动语态 we often plant trees in spring怎么变被动语态 变成被动语态 People plant trees every spring They plant some trees every spring.（改为被动语态） 改为被动语态：We plant trees every spring. 英语被动语态转换快1)We should plant trees in spring.(改为被动语态）Trees in 将下列句子变成被动语态 1.People usually plant trees in spring.2.You sho People plant trees near the river.的被动语态怎么变 in spring,people plant many trees on the hill变被动语态 We plant many trees in spring every year （改为被动语态）