天啊,语病太多了啊!我给你修改一下：Autumn;it is from the middle of September to late December.It is the most attractive season in Canada when there are white clouds in the high sky and red leaves upon the hills.But when you take a close look at these leaves,you will find that they are not the same red; some are purplish,some dark,some fiery,and some orange.What's more,the different colors of green gives us another extremely beautiful view.主要是根据你的意思意译的,尽量忠实于你的意思,尽量用你用过的词汇.