Mother's Day is coming.But he hasn't bought a present for his mother yet.这个现在完成时的句子中为什么能用非持续动词bought?

Mother's Day is coming.But he hasn't bought a present for his mother yet.这个现在完成时的句子中为什么能用非持续动词bought?
Mother's Day is coming.But he hasn't bought a present for his mother yet.
这个现在完成时的句子中为什么能用非持续动词bought?

Mother's Day is coming.But he hasn't bought a present for his mother yet.这个现在完成时的句子中为什么能用非持续动词bought?
因为没有跟for一段时间
不跟时间,就没必要转换成延续性的

非持续性动词可用于完成时态中, 只是其肯定句不能同时间段连用.

They have arrived . ( 对 )
They have arrived for 30 minutes . ( 错 )
The film has already begun . ( 对 )
The film has already begun ...

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非持续性动词可用于完成时态中, 只是其肯定句不能同时间段连用.

They have arrived . ( 对 )
They have arrived for 30 minutes . ( 错 )
The film has already begun . ( 对 )
The film has already begun for half an hour . ( 错 )

但在完成时态的否定句中时, 可同时间段连用.

如: I haven't heard from my parents for a long time.
我有好长时间没收到父母来信了。　　

He hasn't left home for a week.
他有一个星期没出门了

因此, But he hasn't bought a present for his mother yet.这个句子中 hasn't bought 没有错.

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