John's sobered down a lot after the accident.句子中's是is还是has?为什么?

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John's sobered down a lot after the accident.句子中's是is还是has?为什么?
John's sobered down a lot after the accident.句子中's是is还是has?为什么?

John's sobered down a lot after the accident.句子中's是is还是has?为什么?
sober down
变冷静,沉着; (使)安静下来
John's ( has) sobered down a lot after the accident.
是has表完成而不表被动.
事故之后约翰冷静了许多

John's sobered down a lot after the accident.
=John has sobered down a lot after the accident.
事故之后约翰严肃了许多.

has
就是说"John在经历这事故后已经冷静下来了"

has John在事故之后已经变得沉着多了。

has