Question

关于英语完成时态问题

We have an old musical instrument. It is called a clavichord. It was made in Germany in 1681. Our　clavichord　is kept in the living room. It has belonged to our family for a long time. The instrument was bought by　my　grandfather many years ago. Recently it was damaged by a visitor. She tried to play jazz on it! She　struck the keys　too hard and two of the strings were broken. My father was shocked. Now we are not allowed to touch it.It is　being repaired by a friend of my father's.期中It has belonged to our family for a long time. The instrument was bought by　my　grandfather many years ago. 改成It belonged to our family for a long time. The instrument has bought by　my　grandfather many years ago. 这里的两个时态换了，我怎么看不出来有什么不一样？
第二个问题：怎么表达“我很多年以前就买了这本书了”

Answer 1

It has belonged to our family for a long time.
句末有“for+一段时间”的，前面要用完成时，改后的句子“It belonged to our family for a long time.”哗蔽语法是乱宽州错误的。
The instrument was bought by　my　grandfather many years ago.
句末为“...ago.”，前面用一般过去时，改后的句子“The instrument has bought by　my　grandfather many years ago.”也是语法错误。

我很多年以前就买了这本书了。
I bought this book many years ago.（偏向于强调“这本书”）
如果是强巧蠢调“很多年以前”，就是：
I have bought this book for many years.

Answer 2

第一个问题：It belonged to our family for a long time. The instrument has bought by　my　grandfather many years ago.这句话改的不对，前一句是对的，后一句是过去式者桥时的被动语态，应该这样表达： The instrument was bought by　my　grandfather many years ago.第一句是对的，楼上说的不对，因为belong to 不用于完成时和被动语态。
第二个问题：I bought this book many years ago.
或者：I have had this book for many years .这是主动语态的表达。
被动语态分别是：This book was bought by me many years ago.
This book has been bought by me for many years .
我是高中老师，希望对你有帮助，如果竖碰对你有帮助，请给我一定的分数余嫌谈！

追问

你说belong 头不用于完成时，但是新概念课文原句 It has belonged to our family for a long time.，就是用了完成时啊

追答

是一般不用完成时态，这个是极特殊情况。也不算错但是不正规，新概念毕竟是参考教材，你应该看课本教材的说法

Answer 3

we have bought this book long before