The book which I lost is an interesting English book.
The book which I had lost yesterday was an interesting English book.
應(yīng)該是這樣兩個(gè)句子.第一個(gè)表示陳述事實(shí),所以用一般現(xiàn)在時(shí)is來(lái)說(shuō)明這個(gè)事實(shí)“丟的是一本有趣的書(shū)”而“丟的”則是一個(gè)過(guò)去的動(dòng)作,它沒(méi)有其他動(dòng)作或行為或者時(shí)間與其對(duì)比,所以就用過(guò)去式,而不用完成時(shí).
第二個(gè)句子用完成時(shí)是因?yàn)椤白蛱靵G的”,時(shí)間上有昨天和今天的對(duì)比,它能體現(xiàn)你說(shuō)出這句話之前就已經(jīng)丟了,這就體現(xiàn)兩個(gè)動(dòng)作的先后關(guān)系,所以用完成時(shí).