什么是第三人称单数?只有he she

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• 看语法书看到动词的完成时 讲到主语第三人称单数+has+过去分词+.例句是 He has been to the Great Will 我看到这里完全懵了 别人说是Be的过去分词 但是我实在不明白 has been到底是什么意思 刚刚百度 有人说是 去过的意思 但是这个例句不表示去过吧?He has been busy since then.希望英语达人解释下!还有,说be动词的过去式,是类似于 He is 变成He was这样吗?那个be是系动词还是助动词啊?
• what was she doing when she sliped and hurt herself?我总回答颠倒,这个到底是怎么问的,是问她干什么的时候伤着了自己,还是问他伤到自己的时候干了什么?我总是分不清,回答也分不清.正确回答是：she was getting off the bus when she was sliped hurt herself.我总是回答成：she was sliped hurt herself when she was getting off the bus.类似的句子还有：what was he doing when he cut himself?这句是问：类似的句子还有：when did he cut himself?he cut himself while he was shaving.（这句又如何翻译）.
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• 当主语是第三人称单数时,那是什么单词?
• He ____(be)an orphan,the nurse looked after him carefully.答案是being 为什么?只有这一个填法吗?
• 当主语是单数（ ） 人称以及（ ） 数名词时用does 什么时候用has ( ) she ( ) a watch?(She has a watch.
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