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?
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