搜狗做题网新概念3中第一课 A puma at large中,HAVE的用法疑惑
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新概念3中第一课 A puma at large中,HAVE的用法疑惑
新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector and somehow managed to escape.为什么第二句用的是HAVE ,而全文用的都是HAD.奇怪（this one must have been in the possession of 为什么不是 this one must had been in the possession of ）
新概念3中第一课 A puma at large中,有一句话：As no pumas had been reported missing from any zoo in the contry,this one must have been in the possession of a private collector and somehow managed to escape.为什么第二句用的是HAVE ,而全文用的都是HAD.奇怪（this one must have been in the possession of 为什么不是 this one must had been in the possession of ）
1）这只puma 已经在野外出现了,而在它出现前,从未有关于动物园丢失puma的报道,所以第一句当然用过去完成时.
2）这只puma 虽然是走失了,但过去一定为某private collector所有,所以用must have been in the possession of .其实不管是过去还是过去的过去,都只能这样表达.must had been in the possession of 是错的,因为按照英语语法规则,情态动词后只能用动词原形,该句中的must是情态动词,其后只能用动词原形have,而不能用过去式 had.
2）这只puma 虽然是走失了,但过去一定为某private collector所有,所以用must have been in the possession of .其实不管是过去还是过去的过去,都只能这样表达.must had been in the possession of 是错的,因为按照英语语法规则,情态动词后只能用动词原形,该句中的must是情态动词,其后只能用动词原形have,而不能用过去式 had.
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