Jack has studied Chinese for 2 years.对for 2 years划线提问!

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Jack has studied Chinese for 2 years.对for 2 years划线提问!
How long has Jack studied Chinese?
为什么不是How long have Jack studys Chinese?
(不是讲当在一般现在时中主语是第3人称单数时,变一般疑问句是要把has变为have吗?Jack不是第3人称吗,后面怎么不用studys呢?)

因为那用的是过去完成时.
have /has +been
三单用has
因为后面要用过去时,studys是一般现代时
[变一般疑问句是要把has变为have]这是谁说的

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