He doesn`t his homework atschool 为什么要用doesn`t

问题描述:

He doesn`t his homework atschool 为什么要用doesn`t

这句话不完整,应该是
He doesn't do his homework at school.
时态为一般现在时,主语为第三人称单数,
所以其否定句要用dosen't
他不在校做作业.
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