请问In the play,she must appear in a bright red dress .中的谓语动词appear为什么不用三单后加S

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请问In the play,she must appear in a bright red dress .中的谓语动词appear为什么不用三单后加S
请问In the play,she must appear in a bright red dress .中的谓语动词appear为什么不用三单后加S

请问In the play,she must appear in a bright red dress .中的谓语动词appear为什么不用三单后加S
must是情态动词,后面必须用动词原形.

must 是情态动词,后跟动词原形。