A clock must above all keeps good time．keeps是不是应改为keep?
问题描述：
A clock must above all keeps good time．keeps是不是应改为keep?
答
不应改
主语A clock是第三人称单数
答
yes
keeps -> keep
答
是的 must是情态动词 后应跟动词原形 keep 而above all 是插入语 可换做 Above all,a clock must keep good time.
答
不是。主语是A clock 所以用第三人称单数形式keeps