I have had this book for two monthsI have had this book since two months ago.It has been two months since I bought this book 一、现在完成时的构成 （一）肯定式主语＋助动词have ／has ＋过去分词＋其它说明：这里的have ／has是助动词，没有什么具体意义。当主语是第三人称单数时助动词用has，其余人称一律用have。 has，have的缩略式分别为's或've。规则动词过去分词的构成与过去式的构成方式一样，不规则动词可参看不规则动词表。实例：1）I've just copied all t...
