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she often appears on the stage as a young girl.she must appear in a bright red dress这两句中一个appear 作为第三人称加了S.但是后面一句当中为什么没加S?
题目详情
she often appears on the stage as a young girl.she must appear in a bright red dress
这两句中一个appear 作为第三人称加了S.但是后面一句当中为什么没加S?
这两句中一个appear 作为第三人称加了S.但是后面一句当中为什么没加S?
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答案和解析
因为第二个appear前加了一个must,must又是一个情态动词,情态动词后边加动词要用动词原型,不管第几人称.即使是过去式,也是情态动词变过去式.记住就行了,情态动词后边加动词原型.
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