when are trees often planted

when are trees often planted when are trees often planted by people改为主语动态 英语语法解答1.When are trees often planted? ,为什么"planted"要用过去式.2.W There are many trees planted Lots of trees are planted on___side of the road There are also 20 trees to be planted什么意思 They planted one h_____ trees yesterday. There are more than Along____ side of the streets are planted trees and flowers. trees are planted in our city every year. 英译汉 .Trees are planted on both sides of the road. 英语翻译1.We planted trees here every years.(提示：Trees are.)2.The 初三英语改被动语态1.They planted more trees last month.2.We often see