It was bought many years ago by my grandfather.这句话里面的被动语态对吗?如果不对那这句话 Mygrandfather bought the intrument many years ago.变成被动语态应该怎么写?谢谢了``````

the instrument was bought by my grandfather many为什么这里不加for.for many...新概念2原句 it was bought by my grandfather many years ago. It was my grandfather who bought the instrument many years ago可以写成my grandfather has bought the instrument many years 还有为什么一定要it做形式主语?直接my grandfather who bought the instrument many years ago不行吗? It was my grandfather who bought the instrument many years ago.书上是这么写的,感觉怪怪的.能不能写成：It was my grandfather bought the instrument before many years. It was my grandfather who bought the instrument many years ago.这句话怎么去理解?是否有错误? The instrument was bought by my grandfather many years It was bought by my father是否可以说It was being bought by my father?同上. It was bought many years ago by my grandfather.这句话里面的被动语态对吗?如果不对那这句话 Mygrandfather bought the intrument many years ago.变成被动语态应该怎么写?谢谢了`````` I bought it the day it was released急! I bought it the day it was released中文是什么意思? You never have noddles ,( ) you?A.do B.haveI bought a skirt yesterday .many people thought it was very ( )A.expensive B.high can you pass me the dictionary yesterday.a which was bought b you bought it c you have bought 1.There were _____ mistakes in the exam ______ he failed it.A.so many...as B.such many...asC.so many...that D.such many...that2.I bought a new book by mail.The price of it was 14 yuan.A.postage included B.postage includingC.postage include D.postage 改几个句子（将被动语态改成主动语态）注意时态~1.It is called a clavichord.2.It was made in Germany in 1681.3.Our clavichord is kept in the living room.4.The instrument was bought by my grandfather many years ago.5.Recently it was （）he bought in the shop yesterday?A What was it that B Was it what that C What it was that D Was it that what is your watch worth as much now as it was when you bought it? 这道题是SAT的历年真题这道题是SAT的真题Karl bought x bags of red marbles for y dollars per bag,and z bag of blue marbles for 3y dollars per bag.If he bought twice as many bags of blue marbles as red marbles,then in terms of y,what was I bought a watch. It was made in Japan.合成一个句子 I bought a watch _______ _____Japan. 两个空 how many has the car been washed since he bought it?有什么错?