百度作业网I must （can't/isn't)see a doctor 换He 做主语 是不是都不用第三人称单数 为什么?
来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/07/06 04:45:24
I must （can't/isn't)see a doctor 换He 做主语 是不是都不用第三人称单数 为什么?
那I do not like doctors为什么He doesn't like doctors
那I do not like doctors为什么He doesn't like doctors
must 和can't 是情态动词,没有人称和数的变化,不管主语是I 还是He,都不需要变.
is 不能和 I 连用.
而且本句中see 是动词原形,不能用isn't .
补充：
like 是实意动词,否定句必须借助于助动词do 或does 等,主语是I ,用don't ,主语是 He,用第三人称单数的助动词doesn't.
is 不能和 I 连用.
而且本句中see 是动词原形,不能用isn't .
补充：
like 是实意动词,否定句必须借助于助动词do 或does 等,主语是I ,用don't ,主语是 He,用第三人称单数的助动词doesn't.
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