We plant trees every spring属于哪种基本句型?

We plant trees every spring属于哪种基本句型? 语法练习：Every spring we plant trees on the hill. 改为被动语态：We plant trees every spring. we plant trees every every year we plant -------- trees We plant many trees in spring every year （改为被动语态） 改被动语态 '1.We plant trees every spring.2.They took the boy to They plant some trees every spring.（改为被动语态） 变成被动语态 People plant trees every spring "We can plant trees in spring."对"plant trees"提问,怎么提? When should we plant the trees They (〉in spring. we often plant trees in spring怎么变被动语态