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Sheoftendoesherhomeworkinherbedroom.改成否定是Shedoesn'toftendoherhomeworkinherbedroom.为什么是Shedoesn'toftenoftendo而不是Shedoesn'toftenoftendoesdo和does有什么区别,我应该怎么避免?

题目详情
She often does her homework in her bedroom.
改成否定是
She doesn't often do her homework in her bedroom.
为什么是She doesn't often often do 而不是She doesn't often often does
do 和does有什么区别,我应该怎么避免?
▼优质解答
答案和解析
前面有个助动词doesn't了,所以后面就是do了
do是第一二人称,does是 第三人称啊