问题标题：
关于英语完成时态问题Wehaveanoldmusicalinstrument.Itiscalledaclavichord.ItwasmadeinGermanyin1681.Ourclavichordiskeptinthelivingroom.Ithasbelongedtoourfamilyforalongtime.Theinstrumentwasboughtbym
问题描述：
关于英语完成时态问题
Wehaveanoldmusicalinstrument.Itiscalledaclavichord.ItwasmadeinGermanyin1681.Our clavichord iskeptinthelivingroom.Ithasbelongedtoourfamilyforalongtime.Theinstrumentwasboughtby my grandfathermanyyearsago.Recentlyitwasdamagedbyavisitor.Shetriedtoplayjazzonit!She struckthekeys toohardandtwoofthestringswerebroken.Myfatherwasshocked.Nowwearenotallowedtotouchit.Itis beingrepairedbyafriendofmyfather's.期中Ithasbelongedtoourfamilyforalongtime.Theinstrumentwasboughtby my grandfathermanyyearsago.改成Itbelongedtoourfamilyforalongtime.Theinstrumenthasboughtby my grandfathermanyyearsago.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”
侯丽敏回答：
Ithasbelongedtoourfamilyforalongtime.句末有“for+一段时间”的,前面要用完成时,改后的句子“Itbelongedtoourfamilyforalongtime.”语法是错误的.Theinstrumentwasboughtby my grandfather...
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