We planted these trees last year.怎么改成被动句,求答案

We planted these trees last year.怎么改成被动句,求答案 These trees were planted last year.变成否定句They weren't planted She planted some pear trees last spring.改成否定句 No trees ___ planted last year. I planted some fruit trees last year. 问几道英语题!急!1（ ）these trees were planted last year? A.By Whom B She planted some pear trees last spring改成被动语态是什么 初三英语改被动语态1.They planted more trees last month.2.We often see we planted many trees in our school last spring 改为 被动 语态 Trees are planted every year.这句为什么要用被动语态 They plant 10 trees every year.改成被动句 Some trees weren't planted by people last year.不是否定句中用any吗,怎