作业帮The boy has a pen.(改为否定句） 为什么是does not have,而不是hasn't?
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The boy has a pen.(改为否定句） 为什么是does not have,而不是hasn't?
The boy has a pen.(改为否定句） 为什么是does not have,而不是hasn't?
The boy has a pen.(改为否定句） 为什么是does not have,而不是hasn't?
The boy hasn't a pen
=The boy doesn't have a pen
注：只有 has,have 作“有” 讲的时候才可以这么说
你说的两种都可以的，
doesn't have
hasn't是现在完成时的用法 且has改为否定时要加个助动词
因为该句子中没有be动词，所以回答是只能由助动词（do）的否定了。
has在这里是有的含义,不是助动词,所以是does not have
have在这里是实意动词
实意动词变成否定用don't 本句中第三人称单数 用doesn't
have在这里是作为动词使用，“有”的意思。改否定句的时候，助动词do提前。
hasn‘t这种形式是作为助动词使用的，如果使用这种格式，那么这句话里就没有实意动词了。
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