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
问题描述：
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
答
must 是情态动词，后跟动词原形。
答
must是情态动词,后面必须用动词原形.