Trees were being planted here this time last year.变过去进行时主动语态

Trees were being planted here this time last year.变过去进行时主动语态 Were there any trees here last year These trees were planted last year.变成否定句They weren't planted 过去进行时的主动语态变被动语态怎么变 最好有例句 现在进行时、过去进行时、一般将来时、现在完成时 英语主动语态变被动语态例句 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 ()trees were planted last year.用thousands of 还是 two thousand we built this building last year.(变为主动语态） 变被动语态 he has forgotten you.This time last year I was learnin She planted some pear trees last spring.(被动语态)