i bought it when i was living in the china,为什么这里要用was living 来表达?

When have you bought the book?Two weeks ago.I have bought it for two weeks. it was yesterday __ i bought the computer A that B when i hate it when it rains.it is much(w)than it was yesterday i bought it when i was living in the china,为什么这里要用was living 来表达? I bought it when i was living in china句子中如果was living改为lived意思变吗? i had to take out insurance when i bought the i bought it at the shopping mall. 它发行的当天我就买了.I bought it the day it was released.I bought it the day （when）it was released.不要when吗?这是什么句式 Have you bought it?--When( )you ( )it?如题：是用一般过去时还是现在完成时? 还有I have bought it.--When ( )you ( )it? He (when还have gone)to see his father three days ago. 为什么这样填啊? I _____ a dictionary.I ____ it in the bookshop.A.have bought;bought B.bought;bought The radio set last week has been out of orderA.I bought B.I bought it C.which I bought it D.what I bought I bought a computer for ___.I often use it. I bought a computer for ___.I often use it. i have bought a new watch .--where and when ___you_____ it A.did ;buy B.do ; buy C.have ;bought D.will; buy The radio set () last week has gone wrong.A.I bought it B.which I bought itC.I bought D.what I bought I bought it the day it was released急! I bought it the day it was released中文是什么意思? The computer( )last week has gone wrong .A.which I bought it B.I bought为什么?