这三个都是助动词,他们的原型分别为did do does ,他们的原型都可以引导一般疑问句（回答只用yes ,no的疑问句）并且当他们引导一般疑问句时后面都要加动词原形.而你提问就是回答他们原型引导的一般疑问句的否定句的词...
didn't 、don't 、doesn't分别怎么用?
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