主動語態(tài)是主語是謂語的動作方,被動語態(tài)則相反,主語是謂語的被動作方.
這句話的結(jié)構很簡單,I是主語,bought是謂語,the radio 是賓語.for my aunt,in a shop in Shanghai這些可以當作修飾,暫時無視.
反過來就是the radio當主語,was bought 當謂語,I當賓語,則主格變賓格.
那么就可以寫出 The radio was bought by me.
然后可以將for my aunt,in a shop in Shanghai添入即可.
整句話就是 The radio was bought for my aunt by me in a shop in Shanghai.
就考試而言,這樣已經(jīng)正確了.