答:trees turn green.中turn是系动词,green是表语.这个句子没有被动语态.
它的过去完成时态就是:The trees had turned green before sth.happened.
原句:I enjoyed my trip so mucth that-结果状语从句.
结果状语从句= I didn't realize (that)-宾语从句.
宾语从句=the weather had turned bad.
翻译:我对我的旅行非常满意以致于都没有注意到天气已经变坏了.