Tom has never been to China..(在第一个助动词后)这里的has是助动词吗?

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Tom has never been to China..(在第一个助动词后)这里的has是助动词吗?
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Tom has never been to China..(在第一个助动词后)这里的has是助动词吗?
Tom has never been to China..(在第一个助动词后)
这里的has是助动词吗?

Tom has never been to China..(在第一个助动词后)这里的has是助动词吗?
has是第三人称单数后边的助动词,这里是现在完成时,真正的动词时:been,原型就是be,be这里是个连系动词,英文里边叫做linking verb,这里是主系表结构.

HAS是现在完成时态第三人称单数的助动词.
真正的动词是后面的BEEN(BE)